The Shi'ah scholars say that the Sunnis do not acknowledge...

The Shi'ah scholars say that the Sunnis do not acknowledge the existence of any person to whom all questions regarding Islam could be referred, which means that they regarded Islam as imperfect.

That is the reason why they had to resort to the theory of analogy, which they have put forward because they say that in the case of the questions which have not been provided for in the Sunnah, they have no alternative but to compare one question with another and to depend on hypothetical similarities for the purpose of deducing rules of law. The Shi'ah naturally do not share such a view. Imam Ali in Nahjul Balagha has denounced such a view and so have all other Imams.