Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

It is therefore evident that the criterion of reason is imperfect, as proven by the disagreements existing between the ancient philosophers as well as by their want of consistency and their propensity to change their own views. For if the criterion of intellect were perfect, all should have been united in their thoughts and agreed in their opinions (83:5)

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