Best summary on the value of doubt I've heard

In a recent interview in the Christian Century, author Ron Hansen crystalized what I've always thought in an unspoken cloud of ideas. The question is about his new book based on Gerard Manley Hopkins (a poet I've always loved). Now I've requested the book from the library--it's called Exiles. Anyway, the question and answer are as follows:
When people think of Hopkins they often think first of his faith. But he also wrestled with doubt.

I have a priest friend who points out that the opposite of faith is not doubt but certainty. I think God intended that--it is a way of making us creative instead of smug in our belief. God plants in us the seed to love and worship God, and the seed is enough to make us want to seek God out, but not enough to fully get there. That reaching, that striving, is what God is really interested in--that creative activity that all of us should pursue.

Amen Bro. Hansen--I'm gonna comment on Jeremy's "one minute sermon" post that this would be my entirely borrowed one minute sermon.