The Conferences Of John Cassian by John Cassian
Chapter III. How the juniors ought not to discuss the orders of the seniors.
Wherefore if, as we believe, the cause of God has drawn you to try to copy our knowledge, you must utterly ignore all the rules by which your early beginnings were trained, and must with all humility follow whatever you see our Elders do or teach. And do not be troubled or drawn away and diverted from imitating it, even if for the moment the cause or reason of any deed or action is not clear to you, because if men have good and simple ideas on all things and are anxious faithfully to copy whatever they see taught or done by their Elders, instead of discussing it, then the knowledge of all things will follow through experience of the work. But he will never enter into the reason of the truth, who begins to learn by discussion, because as the enemy sees that he trusts to his own judgment rather than to that of the fathers' he easily urges him on so far till those things which are especially useful and helpful seem to him unnecessary or injurious, and the crafty foe so plays upon his presumption, that by obstinately clinging to his own opinion he persuades himself that only that is holy, which he himself in his pig-headed error thinks to be good and right.