LXXXI. (228) It is best, therefore, to trust in God, and not in uncertain reasonings, or unsure conjectures. "Abraham trusted in the Lord, and it was counted to him for Righteousness."[Ge 15:6.] And Moses governed the people, being testified to that he was faithful with his whole house. But if we distrust our own reason, we shall prepare and build ourselves a city of the mind which will destroy the truth. For Sihon, being interpreted means destroying. (229) In reference to which he who had dreamed, waking up, found that all the motions and all the advances of the foolish man are merely dreams that have no portion of truth in them, for the very mind is found to be a dream; and the only true doctrine is to believe in God, and to trust to vain reasonings is a mere delusion. But irrational impulse goes forth and proceeds to each extremity, while both the reasonings and the mind corrupt the truth. On which account, Moses says that "fire went out of Heshbon, and flame out of the city of Sihon." So absurd is it to trust either to plausible reasonings, or to the mind which corrupts the truth.