Neither charity alone nor faith alone can produce good works, any more
than a husband alone or a wife alone can have offspring. The truths of
faith not only illuminate charity, but qualify it, too; and, moreover,
they nourish it. A man, then, who has charity and not truths of faith,
is like one walking in a garden in the night-time, snatching fruit
from the trees without knowing whether it is of a good or evil use.
--_True Christian Religion, n. 377_