The (a.

The (a.s.) strongly condemned the use of qiyas and other such methods invented by others as means whereby they would justify their derivations when they lacked concrete evidence. Because of this, many strong confrontations happened between them and these people, and we may discuss this subject in detail in our forthcoming book about Imam As-Sadiq (a.s.) because the most violent of such confrontations took place during his time when promoters of various sects were free to express their views.