It is not impossible to think that the minds of philosophers sometimes act like those of other mortals, and that, having once been determined by diverse circumstances to adopt certain views, they then look for and naturally find reasons to justify these views.

Wisdom is not to be obtained from textbooks, but must be coined out of human experience in the flame of life.

Lastly, literature and philosophy both allow past idols to be resurrected with a frequency which would be truly distressing to a sober scientist.

Liberalism is an attitude rather than a set of dogmas - an attitude that insists upon questioning all plausible and self-evident propositions, seeking not to reject them but to find out what evidence there is to support them rather than their possible alternatives.

The business of the philosopher is well done if he succeeds in raising genuine doubt.

Again, both literature and philosophy work by appealing to certain reigning idols.

Let philosophy resolutely aim to be as scientific as possible, but let her not forget her strong kinship with literature.