As explained in the first part of the topic, Islam has spread much more quickly compared to other religions all over the world. The traits of Prophet Muhammad (PBUH&HP) were introduced as one of the reasons. Here, the effect of the scientific and social interactions with the rest of the world throughout the Islam's history is discussed. 

 As an introduction, it is good to know that Islam has adopted two types of regulations; confirmed rules and established ones. The Islamic approach regarding the confirmed rules -the regulations which existed before and were conserved or revised if needed- is one of the keys to the development and permanence of Islam. And, this will be the focus of this article.   

Saying Yes to the Good Costumes throughout Islam's History

The Islamic approach to the habits and rules that were common in the pre-Islamic era was that it neither opposed them totally nor accepted them entirely. In some cases, Islam has affirmed and preserved some rules. That was when those rules or customs were not in contradiction to the social order and the living facilities of humans or in case of the righteous customs and traditions that existed before the emergence of Islam; e.g., some of the rules on making contracts. 

However, some of the useful regulations required to be revised and this was accomplished by adding some conditions. On the contrary, some customs and routines were opposed and removed due to the bugs and disadvantages or because they were manipulated or misused for personal benefits; e.g., usury (Riba) [1].

The rules conserved by Islam, such as those about the ownership and property, are called confirmed rules. On the other hand, the rules instituted by the Islamic jurisprudence which never existed before are called established rules [1]. This demonstrates that Islam has always been in constant interaction with the world, and the positive aspects of human societies are considered. Hence, the message of Islam and its framework have not been far from what people are familiar. This consequently has made it easier to accept Islam.

Seeking knowledge; A Way to Spread Islam

Islam has urged everyone to seek knowledge. The first verse of the Quran revealed to Prophet Muhammad (PBUH&HP) enjoined reading which is the key to knowledge: “Read in the Name of your Lord who created” (96:1). Literacy and having knowledge are so important in Islam that Quran equals illiteracy to being in darkness. According to Prophet Muhammad (PBUH&HP), seeking knowledge is obligatory (Wajib) for every Muslim and God loves those who seek knowledge [2].

Learning and seeking knowledge have been emphasized such that Muslims have been encouraged even to travel in order to learn things. Imam Ali (AS) recommended traveling to acquire privilege and named gaining knowledge as one of the achievements of traveling [3]. Prophet Muhammad (PBUH) advised seeking knowledge even if for that purpose one should go to the lands far away [4].

The Holy Quran also addresses the believers as those who are not affected by the wrong behaviors of others since they have been guided. So, the believers can peacefully learn from the positive aspects of others. Another proof of the attention paid to knowledge in Islam is that Muslims used to release the prisoners of wars who taught literacy to a certain number of Muslims. All these emphases and recommendations have urged Muslims to travel to gain knowledge. As a result, Muslims who traveled to other places and countries were practically the messengers of Islam there, which, in consequence, accelerated the spread of Islam.

Continuous interaction with the world During Islam's History 

The actual advances all over the world are the outcomes of the efforts that various nations and civilizations have made in the course of time, among which are the Islamic civilizations [6]. Muslims in different countries, like Spain and Italy, have always been in interaction with other people; therefore, they could transfer the Islamic civilization and culture to others and also receive from them. As an instance, in the battle of the Trench (Khandaq), Salman Farsi proposed to dig a trench around Medina.

This was a tested strategy in Persia, and Prophet Muhammad (PBUH&HP) accepted it. Many of the important Arabic resources and books were translated into European languages, some of which were later on taught and used as references in scientific centers in non-Muslim countries. The bonds between Muslims and Christians through marriage [i] and social relationships were of other means to expose non-Muslims to Islam [7]. All these factors have helped the quick spread of Islam.

From what has been discussed, we can see that the Islamic approach of making regulations under the form of confirmed rules, the encouragement to obtain knowledge and literacy, and cultural exchanges with the rest of the world played significant roles in attracting many savants and people to the religion of Islam.    

Notes:
[i] This kind of marriage named Interreligious marriage is permitted in Islam under the certain conditions. 

References:

1. spreading Islam
2. “Misbah al-Shariah”, p. 13.
3. M. Nuri, “Mustadrak al Wasail”, vol. 18, p. 115.
4. “Misbah al-Shariah”.
5. “Ghurar al-Hikam wa Durar al-Kalim”, p. 46, T. 188.
6. history of Islam
7. A. Velayati, “Dynamism of Islamic and Iranian Culture and Civilization”, vol. 1. 

Looking at Imam Hussain (AS)'s movement and the incidents that took place on Karbala, one might wonder if Imam Hussain (AS) ever had the intention of going to war with Yazid or not. In what follows, we raise some questions that will reveal Imam Hussain (AS)'s real attitude toward war.

1. Why Would He Leave Medina to Mecca?

He did not wish to take the oath of allegiance of a ruthless and corrupt person as Yazid, so he decided to peacefully migrate from Medina to Mecca in which many people had not accepted Yazid’s oath of allegiance yet. In his will which he wrote before leaving Medina, he says:

“I am not leaving here out of selfishness or with the aim of oppression or corruption, but for the sake of improving Muslims’ condition of life. I want to enjoin the right (Amr bi-l-ma’ruf) and forbid the wrong (Nahy’ ani-l-munkar) and to act according to Prophet Muhammad (PBUH&HP)’s and Imam Ali’s (AS) way”.

2. Why Did Imam Hussain (AS) Take All His Property and His Family with Him?

His first motivation to leave Medina was migration, not war. So he left Medina to Mecca along with his family and companions without making any violent move against Yazid. On the day of Ashura on which Imam Hussain (AS) was martyred, 17 to 19 people of his family and relatives were among his companions, including some women and children. Among the martyrs of Karbala, also, there were five teenagers and children. One might ask, as Charles Dickens once asked if Imam Hussain (AS) were after worldly desires as taking over the throne, why would he take his family and children with him and risk their lives?

3. Why Would He even Go to Kufa? Should He Have Left Kufa People’s Letters Unresponded?

Imam Hussain (AS) had no intention of going to Kufa, but he was persuaded to do so by the many letters he received from Kufa people asking him to help them against Yazid’s tyranny. His speech in front of Hur’s army proves this fact: 

“O’ people! This is my last word to you so that there would be no excuse in Allah’s presence. I would not come to you if you had not sent your letters and messengers and asked me to come to you. You told me that you didn’t have a leader and wanted Allah to guide you through me. So, if you still keep your words, I will come to your city, and if you don’t want me to come, I will return.”

4. Why Did He Refuse to Fight with Hur’s Army Despite His Strength?

When surrendered by Hur and his army, Zuhair, one of Imam Hussain’s (AS) companions, suggested fighting them. Since they were not still much in number and Imam Hussain’s (AS) camp had the strength to defeat them. However, Imam Hussain (AS) rejected his view and told him that if there would be a war, he did not wish to be its initiator, though he would defend himself if necessary.

5. Why Would He Wish to Postpone the War even for One More Day

Imam Hussain (AS) wanted to postpone the war as much as possible, not because he was afraid of fighting, but to give the enemy more time to think twice about their wrong decision. So, when on the evening of the 9th of Muharram, Umar ibn Sa’ad gathered his army and got them ready for the war, he sent them a message and asked them to postpone the war until the day after and he spent the night praying to Allah.

Even on the very day of Ashura, Imam Hussain (AS) did his best to dissuade the enemy of choosing the wrong path and losing the God-given blessing of life for a ruthless tyrant as Yazid and his vain intentions. That is because Imam Hussain (AS) who was the spiritual leader of Muslims and cared about their fate more than his own life, found it his responsibility to guide them toward what is right before it was too late [i]. 

Notes:

[i] For more information see Salam Islam's ebook: 40 Points about Imam Hussain (AS) and the Event of Karbala