"It is the heart of truths, and the heart of truths is impossible. Ibn Tumart wanted to emphasize the impossibility of a single branch being proven from two contradictory origins by explaining the four impossibilities that result from assuming this proof. What he wants to emphasize through this is that if a ruling is based on a certain origin, and we find that it is not congruent with another correct origin proven by mutawatir (mass transmission), then the first origin is not an origin, and the ruling must be based on its correct origin. Perhaps it would be clearer and easier to understand to prove directly that there are never two contradictory origins, but rather one origin, and whatever rulings are congruent with it are correct, and whatever is not congruent with it is false. The impossibility of a single origin being proven for two contradictory branches: a single origin - like the prohibition of alcohol - cannot issue two contradictory rulings, such as ruling it permissible and ruling it forbidden. This is because assuming such issuance leads to the aforementioned four impossibilities with the same previous explanation. For this reason, differences in rulings become unjustified, because a single origin can only issue one ruling. Many people have fallen into error as a result of their negligence of this rule, saying: 'Every mujtahid is correct,' and they made this statement a ladder to demolish the Sharia, attribute rulings to their non-source, reverse truths from their subjects, make the lawful unlawful and the unlawful lawful, and make the Sharia contradictory. They followed the saying of every speaker, even if they contradicted each other, and believed in the correctness of mujtahids, even if they conflicted. This last saying clarifies that the Mahdi's reasoning in theorizing the relationship between the origin and the truth is flawed. The truth is that this saying has a clear flaw, because although a single origin does not contain more than one ruling in reality, understandings may differ regarding the intended meaning of that single origin when interpreting it, leading to different rulings based on differing understandings. The Companions, may God be pleased with them, used to differ in understanding a single origin. The difference in madhhabs is based on this matter."