William James, The Varieties of Religious Experience (1902)
“ The test is a perfectly plain one of fact. Theology based on pure reason must in point of fact convince men universally. If it did not, wherein would its superiority consist? If it only formed sects and schools, even as sentiment and mysticism form them, how would it fulfill its programme of freeing us from personal caprice and waywardness? This perfectly definite practical test of the pretensions of philosophy to found religion on universal reason simplifies my procedure to-day. I need not discredit philosophy by laborious criticism of its arguments. ”
