"Most people go through life with a whole world of beliefs that have no sort of rational justification, and that one man’s world of beliefs is apt to be incompatible with another man’s, so that they cannot both be right. People’s opinions are mainly designed to make them feel comfortable; truth, for most people is a secondary consideration."
— Bertrand Russell, The Art of Philosophizing
and Other Essays (1942), Essay one, The Art of Rational Conjecture.

Wittgenstein's Phd. Dissertation in Cambridge