If they contain only the views or opinions of the companions themselves and not those of the Prophet, they are not authoritative as sources for religious injunctions. In this respect the ruling of the companions is like the ruling of any other Muslim. In the same way, the companions themselves dealt with other companions in questions of Islamic law as they would with any Muslim, not as someone special.
The Book of God, the Holy Quran, is the principal source of every form of Islamic thought. It is the Quran which gives religious validity and authority to every other religious source in Islam. Therefore, it must be comprehensible to all. Moreover, the Quran describes itself as the light which illuminates all things. Also it challenges men and requests them to ponder over its verses and observe that there are no disparities or contradictions in them. It invites them to compose similar work, if they can, to replace it. It is clear that if the Holy Quran were not comprehensible to all there would be no place for such assertions.
To say that the Quran is in itself comprehensible to all is not in any way contradictory to the previous assertion that the Prophet and his Household are religious authorities in the Islamic sciences, which sciences in reality are only elaborations of the content of the Quran. For instance, in the part of the Islamic sciences which comprises the injunctions and laws of the Shari’ah, the Quran contains only the general principles. The clarification and elaboration of their details, such as the manner of accomplishing the daily prayers, fasting, exchanging merchandise, and in fact all acts of worship (’ibadat) and transactions (mu’amalat), can be achieved only by referring to the traditions of the Holy Prophet and his Household.
As for the other part of the Islamic sciences dealing with doctrines and ethical methods and practices, although their content and details can be comprehended by all, the understanding of their full meaning depends on accepting the method of the Household of the Prophet. Also each verse of the Quran must be explained and interpreted by means of other Quranic verses, not by views which have become acceptable and familiar to us only through habit and custom. Ali has said: "Some parts of the Quran speak with other parts of it revealing to us their meaning and some parts attest to the meaning of others."11 And the Prophet has said, "Parts of the Quran verify other parts." And also: "Whosoever interprets the Quran according to his own opinion has made a place for himself in the fire."
As a simple example of the Quran through the Quran may be cited the story of the torture of the people of Lot about whom in one place God says, "And we rained on them a rain," and in another place He has changed this phrase to, "Lo! We sent a storm of stones upon them (all)." By relating the second verse to the first it becomes clear that by "rain" is meant "stones" from heaven. Whoever has studied with care the hadiths of the Household of the Prophet, and the outstanding companions who were the followers of the Prophet, will have no doubt that the commentary of the Quran through the Quran is the sole method of Quranic commentary taught by the Household of the Prophet.
Divisions within Shia Islam
