Happy feast day of St. Thomas! I've always loved St. Thomas, not just because he was brilliant but because he was a saint. The Church canonized him because of his holiness.
Yet certainly his great intellectual ability was a wonderful way that Thomas used to get to know and understand God more. Thomas spent his whole life passing that wisdom on to others.
The web has many resources on St. Thomas. Here is one page, that has links to other useful sites (although some of the links don't work).