In a house, if there are ten persons, then all of them will not have exactly the same way of thinking. Unity in such a place will come only when a person has the ability to tolerate others' difference of opinion. The same is true of a society or community -- there will be many differences between people in a community. Differences cannot be eliminated. Even if two prophets are sent together, they will develop differences, as happened in the case of Prophets Aaron and Moses. Even the Companions of the Prophet developed differences with him on several occasions. In such a situation, unity will come only when there is toleration of differences. This is the secret for unity.