Q: St Hilary, what advice would you give to someone who wishes to study theology?
A: “Enter these truths by believing, press forward, persevere. And though I may know that you will not arrive at an end, yet I will congratulate you in your progress. For, though he who pursues the infinite with reverence will never finally reach the end, yet he will always progress by pressing onward. But do not intrude yourself into the divine secret, do not, presuming to comprehend the sum total of intelligence, plunge yourself into the mystery of the unending nativity; rather, understand that these things are incomprehensible.”
-De Trinitate, II, 10, ii (PL, 10, coll. 58-59)