Os Guinness Quote

To come to faith on the basis of experience alone is unwise, though not so foolish as to reject faith altogether because of lack of experience... the quality of a Christian's experience depends on the quality of his faith, just as the quality of his faith depends in turn on the quality of his understanding of God's truth.

In Two Minds: The Dilemma of Doubt & how to Resolve it (ed. IVP Books, 1976)