William James, The Will to Believe (1896)
“ The characteristic sort of happiness indeed that philosophies yield has mainly consisted in the conviction felt by each successive school or system that by it bottom-certitude had been attained. “Other philosophies are collections of opinions, mostly false; my philosophy gives standing-ground forever”—who does not recognize in this the key-note of every system worthy of the name? A system, to be a system at all, must come as a closed system, reversible in this or that detail, perchance, but in its essential features never! ”
