Reading Chesterton's biography of "The Dumb Ox". There is (as is always the case with Chesterton) such a wealth of wit and insight here, that Aquinas' quote, as related by Chesterton, seems appropriate:
"When asked for what he thanked God most, he answered simply, 'I have understood every page I ever read.'"
Were I Aquinas, it would be enough to say I have understood every page I have ever written. But that was probably far too modest a goal for such a prodigious mind.