After introducing the axioms of Islam and finding faith in them, the next step in this life-changing journey is to accomplish certain commands as a result of those beliefs which will lead us to a life of eternal satisfaction and bliss. Now one might wonder, what relates those fundamental principles or axioms – i.e., Monotheism (Tawhid) [1], Prophethood (Nubuwwah), and Afterlife (Ma’ad) – to practical principles in Islam? Are they even related? If yes, how is this relationship justified? What comes next will hopefully provide an answer to these questions.  

What is religion?

To have a better understanding of the relationship between the axioms and practical principles in Islam, we should first fully grasp the meaning of religion. Religion, in one sense, is defined as the collection of a series of fundamental and necessary beliefs -axioms- along with some practical commandments. The beliefs are the foundations, and the instructions are the means of putting the axioms into practice that may include juridical, legal, social, ethical, spiritual, and political rules and regulations.

The Elements of Religion

Having the definition of religion in mind, we can consider two elements or constituent parts for it: 1. Beliefs (axioms), 2. The practical commandments and instructions (practical principles). Typically, since the instructions are devised with regard to the axioms, then these principal beliefs are considered as primary, a prior, and foundational, while the practical commands become subsidiary, ancillary, and as the pillars built on those foundations.

In addition, according to the Islamic doctrine, the prerequisite of this religion is one’s faith in the existence and Oneness of God as well as in the Prophethood of Muhammad (PBUH&HP) and the coming of the Judgment Day; that no one deserves worshiping other than Allah Almighty, Prophet Muhammad (PBUH&HP) has been chosen for Prophethood by Him as the last prophet and that this life is surely followed by another one.  

The first two are, as a matter of fact, the content of what we call Shahadatain or the two testimonies, that by uttering them, one will enter the world of Muslims. But, this is only a gateway to Islam and a platform for further practices that will ultimately make one a perfect Muslim and believer.

The Nature of the Relationship between the Elements of Religion

We might suppose many kinds of relationship between the elements - Axioms and Practical principles - of religion, including the pearl and shell relationship, the innate and parallel relationship, the root and stem relationship.

One case scenario is to consider the relationship between these two constituent parts like a pearl and its shell; that is one of these parts is primary, and the other secondary, and what matters is the primary one. In other words, it is enough for one to find faith in the axioms of religion and the practical principles are only there for us to reach those axioms; that being done, they have fulfilled their purpose, and there is no need for them anymore.

Analogously, the shell does not worth anything by itself; its only importance is to keep the pearl safe. Anyone who looks for a shell is actually after the pearl in it, and once he finds it, he will throw away the shell instantly.

Another case scenario regards this relationship of parallel and innate kind. It claims that religion has three aspects: Islamic law, the path, and truth. The axioms of religion are its truth, while the law and path - which are the practical principles of religion -   only provide the way to reach the truth. Thus, like the previous assumption, if someone reaches the truth, then he will no more need the law and the path. 

But what is the most proper relationship between these two? This association is neither like pearl and shell nor of parallel and innate kind. While we believe in the primacy of the axioms, we don’t consider the practical principles of religion as marginal and unimportant; there is a mutual relationship between practical doctrines of Islam and theoretical knowledge of religion.

If there is any suitable way of elucidating this issue metaphorically, that would be through the relationship of the root and stem of a tree. In this kind of relationship, no part can be considered as independent of the other, they closely correlate. Believing in certain axioms necessitates the manifestation of a particular demeanor which requires the reinforcement of the belief in those fundamental principles. Similarly, every root has its own kind of stem and fruit that will grow and be nourished by the sun and ultimately fortify the root.

The Difference between Axioms and Practical Principles in Islam

From what we have said so far, it is crystal clear that practical principles require active practice whereas axioms need knowledge and firm belief. Accordingly, in the case of the axioms imitation – no matter from who - is absolutely forbidden and they should be accepted through careful investigation and precise reasoning individually, while practical principles are mainly practiced with a degree of submission to God; the main purpose of these rules is the action itself.

That is why it is said that knowing and understanding the axioms is an “individual duty” – i.e. the duty that every single Muslim is bound to perform, e.g., performing Salat - for each Muslim, while being familiar with the practical principles is a “sufficiency [2] duty” – i.e., the duty that will lose its obligation if a group of Muslims has performed it.   

It is noteworthy that the actions and behaviors that practical principles suggest will not result in our spiritual and psychological revolution and development unless we have a thorough understanding of the axioms and have accepted them rationally. In other words, the religion is constituted of certain principles which are its intellectual basis and requires its followers to exhibit specific behaviors; these actions root back in those axioms, and the axioms are prior to them.

What are the Practical Principles?

Let’s have a brief look at the ten practical principles of the religion of Islam:  

Prayer (Salat): The performance of the daily prayer five times a day with a specific form.

Fasting (Sawm): The act of voluntarily preventing oneself from eating and drinking during a particular part of the day – from the time of Dawn Prayer (Salat al-Fajr) until Dusk prayer(Salat al-Maghrib).

The Holy Pilgrimage (Hajj):  An annual Islamic pilgrimage to Mecca, and a mandatory religious duty for Muslims that must be carried out at least once in their lifetime by those who are physically and financially capable of undertaking the journey, and can support their family during their absence.

Alms-tax (Zakat): Paying an exact amount of money that has become obligatory through the rules of Sharia in order to be used in favor of the people in need or for certain beneficial deeds in society.

Khums: A money proportional to one fifth that every person should pay based on some certain criteria.

The Holy Struggle (Jihad): Technically, a special kind of attempt, which includes sacrificing one’s life and property primarily for the sake of Allah, elevating and sustaining Islamic beliefs and standpoints. In this sense, Jihad is the act of Defending the Islamic territory against the assaults and intrusions of outsiders and invaders. Literally, this word is defined as the striving of one’s soul against the temptation of the devil and his own whim.   

Enjoining what is right (al-Amr bi-l-maʿrūf): To invite other Muslims to goodness and righteousness, with regard to certain conditions and through specific manners.

Forbidding what is wrong (nahy ʿani-l-munkar): To dissuade other Muslims from doing what is wrong, sinful or immoral, with regard to certain conditions and through specific manners.

Expressing Love towards Good (Tawalla): To have a feeling of affection and love, affirmation, submission, and acceptance toward guardianship of Allah, Prophet Muhammad (PBUH&HP), and the twelve Imams.

Expressing disassociation from Evil (Tabarra): having a feeling of disassociation and dislike toward the enemies of Allah, Prophet Muhammad (PBUH&HP) and twelve Imams. 

Notes:

[1] That God exists and He is one.

[2] It is enough for this duty to be performed by some people and then be followed by others.

At the beginning of Islam, the number of literates in the whole Mecca was about 17 people (1). In those times, it was even considered as a shame to be able to read or write (2). In the ancient times, people mostly weren’t able to read and literacy was the exclusive privilege of the royal families or rich people. However, in the Arabia, even the royal families couldn’t read or write. Once, Prophet Muhammad (PBUH & HP) wrote a letter to “Bakr ibn Va’il”, a large Arab tribe, and enjoined them to believe in Islam; but when they received the letter, they weren’t even able to read it (3).
In spite of these shameful circumstances, Allah al-mighty sent His most important apostle to the people with only a book as his miracle. The first verses of the Quran, revealed to the Prophet (PUBH & HP), are about reading:
Read in the Name of your Lord who created; (1) created man from a clinging mass. (2) Read, and your Lord is the most generous, (3) who taught by the pen, (4) taught man what he did not know. (5) [96:1-5]

Knowledge and Literacy in Islam

Muslims differentiate between the era before the Messenger (PBUH & HP) and the era after him based on peoples’ knowledge. We call the time before the rise of Islam “The Ignorance era”. 
The holy Prophet (PBUH & HP) taught people that knowledge is the criterion that sets them apart   . The Holy Quran says:
Say, ‘Are those who know equal to those who do not know?’ Only those who possess intellect take admonition (39:9)
About learning, the Holy Messenger (PBUH) says:
 Seek knowledge even if you have to go to China to find it. (4)
Imam Ali (AS) also highlights the Importance of knowledge in his speech with one of his companions:
O Komeil! Knowledge is better than wealth, because knowledge protects you. But for wealth, you have to protect it. Wealth and money get less when you spend them, but by using your knowledge or by teaching it to others you even get more knowledgeable … O Komeil! The ones who love wealth excessively, are like dead people (spiritually) even if they are alive (Physically). However, the spirit of knowledgeable ones will always be alive in the hearts of people even if their bodies are dead. (5)
The Holy Messenger (PBUH & HP) even considered learning as “Vajib” which means that learning is an obligation for every Muslim:
Seeking knowledge is an obligation for every Muslim, men and women (6)
One of the clearest signs that shows the Prophet (PBUH & HP) wanted everybody to be literate and knowledgeable is that he ordered the slaves after the Badr war to teach the children of Medina to read and write and in return, the slaves would be free. (7)

Keeping the Knowledge Safe

The Holy Quran says:
By the pen and what they write (68:1)
We all know that without writing, we weren’t able to communicate our thoughts and ideas with each other and we couldn’t keep them for future generations. In this regard, the Holy Prophet (PBUH & HP) says:
Keep your knowledge safe.
Some people asked:
How can we do that?
The Prophet (PBUH & HP) replied:
By writing it! (8)
Moreover, Imam Sadiq (AS) said to one of his pupils, Mufazzal ibn Umar:
Write and spread your knowledge among the people and if you were going to die, leave your writings for your children because there will be a chaos in the future and in those times, people will not find any peace except in their books (9)
He also said:
Keep your writings because you will need them in the future (10)
Imam Hassan (AS) would gather his children,his niece and nephews and tell them:
You may be considered as kids now, but it is so likely that you will be the elders of many groups and families in the future. Therefore, it is your duty to seek for knowledge. And if there are some people among you who cannot memorize their knowledge, they must write and put their writings in their houses and keep them safe. (11)

Carriers of Books

Action and knowledge are inseparable in the Islamic view. If you act without having enough knowledge and data about the work you’re going to do, you will spoil it and your efforts will be in vain. Imam Sadiq (AS) says:
The one who acts without having enough knowledge is like a passenger who goes on the wrong road. So they get farther and farther from their destination as they go faster and faster. (12)
On the other hand, knowledge without acting is also useless. Imam Ali (AS) says:
Knowledge without action is like a tree without fruit or like a bow without its string (13).
The Holy Quran also says:
The example of those who were charged with the Torah (Old Testament), then failed to carry it, is that of a donkey carrying books. Evil is the example of the people who deny Allah’s signs, and Allah does not guide the wrongdoing lot. (62:5)

Resources

1.  Fotooh al-Boldan, Pg.473
2.   Al-She’r va ash-Sho’ara, Pg.334
3.   As-Sahih fi sirah an-Nabi al-A’zam, Vol.1, Pg.49
4.   Vasa’il al-Shia, Vol.18, Pg.14, number 20 & 23
5.   Nahj al-Balaghah, Utterance no.147
6.   Kafi, vol.1, pg.3
7.   At-Tabaghat al-Kubra, vol.2, pg.22
8.   Bihar al-Anvar, vol.2, pg.151
9.   Kafi, vol.1, pg.52
10.   Kafi, vol.1, pg.52
11.   Kanz al-Ummal, vol.1, pg.752
12.   Tohaf al-Uqul, pg.362
13.   Mizan al-Hikmah, vol.4, pg.2841