129. Everyone may know that man is governed by the principles he assumes, be they ever so false, and that all his knowledge and reasoning favor his principles; for innumerable considerations tending to support them present themselves to his mind, and thus he is confirmed in what is false. He therefore who assumes as a principle that nothing is to be believed until it is seen and understood, can never believe, because spiritual and celestial things cannot be seen with the eyes, or conceived by the imagination. But the true order is for man to be wise from the Lord, that is, from His Word, and then all things follow, and he is enlightened even in matters of reason and of memory-knowledge [in rationalibus et scientificis]. For it is by no means forbidden to learn the sciences, since they are useful to his life and delightful; nor is he who is in faith prohibited from thinking and speaking as do the learned of the world; but it must be from this principle-to believe the Word of the Lord, and, so far as possible, confirm spiritual and celestial truths by natural truths, in terms familiar to the learned world. Thus his starting-point must be the Lord, and not himself; for the former is life, but the latter is death.
