These two types of differences have been indicated by God...
These two types of differences have been indicated by God, the Exalted: "The people were one nation; then God sent forth the prophets, good tidings to bear and warning, and He sent down with them the Book with the truth, that He might decide between the people touching their differences; and only those who had been given it were at variance upon it after the clear signs had come to them, being insolent one to another; then God guided those who believed to the truth, touching which they were at variance, by His leave; and God guides whomsoever He will to a straight path." (2:213) It is inferred from the first part of the verse that primitive man was simple in his beliefs, with a sound natural disposition (fitrah) and far from deviation and desire (haws), even though he would differ from others of his kind on certain matters.
Differences in matters such as these were inevitable in his life's course since man had been created for perfection, and these formed part of - the stages of his growth. In order to settle these differences and elucidate the truth during conflict, Allah, the Exalted, revealed the Book accompanied by the truth, which moved along with it.
On the elucidation and clarification of the truth, the people were divided into two groups-some of them believed and followed what the Book had brought, and others did not believe through insolence and hostility. This is the disagreement concerning faith and conviction, and it is a reprehensible disagreement.
Regarding the third point the necessity of determining the general rule to resolve disagreements-that is indicated by the statement of God, the Exalted: "Nay, but they cried lies to the truth when it came to them, and so they are in a matter perplexing." (50:5) Almighty censures them for the disorder of their state. They have fallen into confusion by their denial of the truth, and He enjoins them to resort to the truth, avoid creating confusion, and maintain the correct order.
Islam has been concerned with removing these differences through training, educating, discipline, and purification. It has urged adherence to `the strong rope' of Allah and abstention from conflict which would result in social discord. It has brought about brotherhood '- among the believers, and made them "merciful one to another" even though they are "hard against the unbelievers" (48:29).