The "inferiority of the rationalistic level in founding belief is just as manifest when rationalism argues for religion as when it argues against it. That vast literature of proofs of God's existence drawn from order of nature, which a century ago seemed so overwhelmingly convincing, today does little more than gather dust in libraries, for the simple reason that our generation has ceased to believe in the kind of God it argued for. Whatever sort of being God may be, we KNOW today that he is nevermore that mere external inventor of 'contrivances' intended to make manifest his 'glory' in which our great-grandfathers took such satisfaction, though just how we know this we cannot possibly make clear by words either to others or to ourselves. ...
The truth is that in the metaphysical and religious sphere, articulate reasons are cogent for us only when our inarticulate feelings of reality have already been impressed in favor of the same conclusion. Then, indeed, our intuitions and our reason work together, and great world-ruling systems, like that of the Buddhist or of the Catholic philosophy may grow up. Our impulsive belief is here always what sets up the original body of truth, and our articulately verbalized philosophy is but its showy translation into formulas. The unreasoned and immediate assurance is the deep thing in us, the reasoned argument is but a surface exhibition. Instinct leads, intelligence does but follow. ...
Please observe, however, that I do not yet say that it is BETTER that the subconscious and non-rational should thus hold primacy in the religious realm. I confine myself to simply pointing out that they do so hold it as a matter of fact."
William James, 2012 [1901-1902], 54-55
"The Reality of the Unseen," The Varieties of Religious Experience