1. Observe Justice

If you observe justice about yourself, you will be trusted in judging others.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.146.

2. The time of Injustice and Treachery

At a time when you see nothing but injustice and treachery, trusting anyone (unheedingly) brings wretchedness. 
Ibn Shu’bah, Tuhaf al-Uqul, p.357. 

3. Constant Calamities 

Following a calamity after another is the herald of liberation from them.
Ibn Shu’bah, Tuhaf al-Uqul, p.357.

4. Investing Your Trust

Do not invest your trust fully on your friend, since if you fail and lose everything because of dedicating all your love and trust to one person, you could hardly survive its disastrous outcomes.  
Ibn Shu’bah, Tuhaf al-Uqul, p.357.

5. Islam, Faith, Assurance 

Islam is the basis on which faith is founded, and then on faith, assurance is built. People hardly reach the last level, that is assurance. 
Ibn Shu’bah, Tuhaf al-Uqul, p.358.

6. This World

Losing your heart to this world brings you pain and grief while being indifferent and pious to it brings peace to your heart and soul. 
Ibn Shu’bah, Tuhaf al-Uqul, p.358.

7. Three Characteristics of a Believer 

The believer finds righteousness in three characteristics: a deep understanding of the religion, avoiding excessiveness in life, and forbearing the hardships. 
 Ibn Shu’bah, Tuhaf al-Uqul, p.358.

8. Allah's Blessings 

Allah bestows His blessings upon a group of people, and it is turned into burdens on them due to their ingratitude; yet, He inflicts others with calamities, and they turn into blessings due to their forbearance. 
Ibn Shu’bah, Tuhaf al-Uqul, p.359.

9. How to Treat Your Family according to Imam Sadiq (AS)

Whoever does good to his family, Allah prolongs his life. 
 Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.8, p.219. 

10. Making Friends

Meet and make friends with someone who elevates and honors you, not the one whose only purpose is to benefit from you and is pretentious. 
Al-Hurr al-Amili, Wasa'il al-Shia, Vol.11, p.412. 

11. Greetings 

Saying hello is a recommended act (Mustahab) while responding to it is obligatory (Wajib). 
Ibn Shu’bah, Tuhaf al-Uqul, p.360.

12. Be Resistant 

Whoever manifests resistance at times of anger, greed, fear, and lust, Allah will protect his/her body against the fire of hell. 
Ibn Shu’bah, Tuhaf al-Uqul, p.361.

13. Well-being 

Well-being is a less valued blessing; it is forgotten when one is blessed with it, yet it will be reminded of as soon as it is gone. 
Ibn Shu’bah, Tuhaf al-Uqul, p.361.

14. Comfort and Hardship

In comfort, Allah blesses you with His beneficence and excellence, and in hardship, the chance of purging [from your sins]. 
 Ibn Shu’bah, Tuhaf al-Uqul, p.361.

15. Water 

Do not pollute the water that people need. 
Abu Ja'far Muhammad Ibn Hasan Tusi, Tahdhib al-Ahkam, vol.1, p.185.

16. Moderation

Allah loves moderation and hates wastefulness.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.4, p.52.

17. Wastefulness 

The least act of wastefulness is throwing away the remaining of [food or drink].
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.6, p.460.

18. The Weather 

If the weather were always bright and sunny, the earth would turn dry, and the plants would burn off the heat; the water in lakes and rivers would go down, and people would suffer; the weather would be hot and dry, and an unknown kind of sickness would emerge. 
 Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.3, p.125.

19. Muslim Friends 

Between two Muslim friends, the one that loves the other is the better one.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.3, p.193.

20.The Elderly and Children 

Respect the elderly and be kind to the children.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.165.

21. A Joyful Life 

Life is joyful with three things: clean air, plentiful and pure water, and a soft land [ready for planting]. 
Ibn Shu’bah, Tuhaf al-Uqul, p.320.

22.Washing Hands

Wash your hands before and after eating. 
Ahmad b. Muhammad b. Khalid al-Barqi, Al-Mahasin, vol.1, p.425.

23. Be Careful About What You Wear

Do not wear clothes that attract much attention, neither clothes, which debases you. 
Muhammadi Reyshahri, Mizan al-Hikma, hadith no. 18080. 

24. Brush Your Teeth

Brushing teeth is among the manners of prophets.
Muhammadi Reyshahri, Mizan al-Hikma, hadith no. 9053.

25. On Expressing Your Opinions 

Do not be the first person who expresses his/her opinion when asking for a consult and avoid suggesting naïve views. 
Muhammadi Reyshahri, Mizan al-Hikma, hadith no. 9868.

26. Paying the Wages of a Worker 

Pay the workers' wages before their sweats are dried [ i.e., right after they have finished their work]. 
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.5, p.289.

27. Manners toward Your Teacher 

Be humble in the presence of the one from whom you learned a knowledge.
 Abu Ja'far Muhammad Ibn Hasan Tusi, Tahdhib al-Ahkam, vol.2, p.36.

28. Justice in Imam Sadiq (AS)'s Words 

Justice is more pleasant than the water, which is offered to a thirsty person.
 Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.5, p.289.

29. A piece of Advice for Industrialists

Every industrialist has to master three characteristics for his/her work to flourish; he/she has to be expert in his/her job, has to be reliable and meet their superior managers' demands. 
Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.78, p.236.

30. People's Needs 

People need three things; security, justice, and welfare. 
Ibn Shu’bah, Tuhaf al-Uqul, p.320.

31. A Father's Best Legacy 

A father's best legacy for his children is manners, not wealth.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.8, p.150.

32. Planning 

Planning shapes half of your life. 
Al-Shaykh al-Saduq, Al-Khisal, p.221.

33. Teenagers 

Take care of teenagers since they are more open to absorbing goodness and virtues.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.8, p.93.

34. Books 

There will be chaotic days when people would not find peace unless within their books.
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.1, p.52.

35. Agriculture 

Agriculture is a precious wealth. 
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.5, p.261.

36. Strengthening Ties 

Strengthen your ties with each other, be kind and generous to each other. 
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.175.

37. Help Each other 

Any believer who solves another believer's problem, Allah will lift seventy of his/her difficulties in this world and the hereafter. 
Mirza Husayn Nuri, Mustadrak al-wasa'il, vol.12, p.413.

38. Fruit Trees 

Do not cut fruit trees, or you will be inflicted with Allah's torment. 
Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.5, p.294.

39. The Best Friend 

My favorite friend is the one who bestows me my faults.
Ibn Shu’bah, Tuhaf al-Uqul, p.366. 

40. Earn Halal Income 

Whoever wishes his/her prayers to be granted, should strive to earn Halal income. 
Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.93, p.373.

Muslims commemorate the fortieth day after the martyrdom of Imam Hussain (AS) and his companions, called Arbaeen, meaning the fortieth day in Arabic. They all gather around the city of Karbala and Imam Hussain’s (AS) shrine, mourning and lamenting the unfair and cruel war between his comrades and those of Yazid Ibn Muawiyah, which led into the death of those pure men and the bondage of their families. 

This commemoration happens every year around the city of Karbala. Muslims begin to walk to Karbala from other towns. They gather together in groups to pray, and especially to mourn the martyrdom of Imam Hussain (AS).
This walk is a hard one. It takes at least three days and lots of energy and time. So, why do Muslims take that? What is the philosophy behind it? 

To answer our questions, first, let’s have a review of the history behind this walk and then move to the other aspects of this commemoration. 

1. What is the Arbaeen Walk?

The history of Arbaeen walk goes back to the first visitors of Imam Hussain (AS) after his death. On the day of Arbaeen, forty days after the tragic martyrdom of Imam Hussain (AS), Imam’s (AS) son, sister and the remaining members of his family and that of the other martyrs came back to Karbala to lament the death of their dear ones besides their graves.  

Their next visitor was Jabir Ibn Abdullah Ansari on the year 61 AH. Visiting Imam Hussain’s (AS) shrine was a tradition in Shiite culture until a short period after Morteza Anasari’s became the religious reference (Marja’) of Shiite Muslims. It was then lessened for some years and then revived. Some other religious references (Marja’) kept this tradition alive among their followers, until the government of Saddam Hussain, which banned all religious Shiite traditions to be performed publically [1]. 

The tradition was revived after the fall of Saddam, and it is still to be continued. 

2. Why on Foot?

Visiting the holy shrines and going on pilgrimages on foot is not something new or belonging to our age. It’s got a long history, and Adam did the first pilgrimage on his visit to Mecca [2]. It isn’t a tradition just among Muslims either. It is performed in other faiths and religions, too. For instance, Caesar made a vow to his God to go on a pilgrimage to the Dome of Rocks if he won the battle against the Empire of Persepolis (Iran). He performed his vow after his victory [3].

Pilgrimages are highly admired, and their act is seen as a way of getting closer to Allah by Imam Sadiq (AS). Visiting the holy shrines of the twelve Imams (AS) is even more praised, especially the sacred shrine of Imam Hussain (AS). Of course, it’s not these shrines themselves that are of value and importance, but the people who have been buried there. Thus, when one makes a pilgrimage toward these shrines, he/she finds the chance to think more about these great personalities who won Allah’s satisfaction and praise and were Muslims in the real sense of the word. So, in every step that a pilgrimage takes toward Imams' (AS) shrines, especially that of Imam Hussain (AS), he/she is getting closer to a source of spiritual blessing, bringing him/her thousands of virtues and wiping away thousands of vices from his/her mind and soul.

3. What is the Philosophy behind the Arbaeen Walk?

The Arbaeen pilgrimage is not merely a long walk. Instead, it is a kind of movement in which despite being in publics, pilgrims have their own private relationship with Allah and Imam Hussain (AS), which finds a new form of divine immaterial dependence and conformance. Thinking about the goals and the history behind the martyrdom of Imam Hussain (AS), the injustice and cruelty imposed on his family and the devotions of his faithful followers brings about many personal and social growth and improvements. 

Meeting other Muslims, exchanging ideas, and making friendships with Muslims of the other countries is another social outcome of this pilgrimage. One finds out that they are not alone in their faith, and have friends all over the world. They may have differences, but they have one thing in common: Belief in Imam Hussain (AS) and his right cause. 

The last and the most crucial point to mention this great gathering is it's a kind of preparation for the grand reappearance of Imam Mahdi (AS), the awaited savior among Muslims. The Arbaeen pilgrimage is to make the minds and souls ready for this great event. It is said that when Imam Mahdi (AS) reappears, he introduces himself as the son of Hussain (AS) [6], whose fame has reached many people through the Arbaeen Pilgrimage; one of the most significant religious gathering around the world, with the estimated number of 40,000,000 people participating in it, whose news is broadcasted all over the world [5].  

References

1. "The background of Arba'een rally/The importance of Najaf-Karbala rally from the scholar's viewpoint." Fars News. Archived from the original on 16 November 2015. Retrieved 4 October 2015.
2. Hor Ameli, Muhammad Bin Hussain Vasayel-o-Shia, Vol 11, p 132
3. Sobhani, Jafar The Light of Eternity p. 696
4. Kamel-o-Ziyarat: Pp 183, 184 and 185
5. Philipson, Alice (19 January 2015). "The ten largest gatherings in human history." The Telegraph. Archived from the original on 6 October 2015. Retrieved 3 October 2015. 
6. Khademi Shirazi, Mohammad Yad’e Mahdi P16, P132