He has some comments in the second book of interviews with Peter Seewald, God and the World:
We all stand in a great arena of history and are dependent on each other. A man ought not, therefore, just to figure out what he would like, but to ask what he can do and how he can help. Then he will see that fulfillment does not lie in comfort, ease, and following one's inclinations, but precisely in allowing demands to be made upon you, in taking the harder path. Everything else turns out somehow boring, anyway. Only the man who "risks the fire," who recognizes a calling within himself, a vocation, an ideal he must satisfy, who takes on real responsibility, will find fulfillment. As we have said, it is not in taking, not on the path of comfort, that we become rich, but only in giving.
Hat Tip to Why I am Catholic