Boys and young men acquire readily the moral sentiments of their social milieu, whatever these sentiments may be.

Some care is needed in using Descartes' argument. "I think, therefore I am" says rather more than is strictly certain. It might seem as though we are quite sure of being the same person to-day as we were yesterday, and this is no doubt true in some sense. But the real Self is as hard to arrive at as the real table, and does not seem to have that absolute, convincing certainty that belongs to particular experiences.

Mankind has become so much one family that we cannot insure our own prosperity except by insuring that of everyone else.

Broadly speaking, we are in the middle of a race between human skill as a means and human folly as an end.

Thought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.

Calculus required continuity, and continuity was supposed to require the infinitely little; but nobody could discover what the infinitely little might be.

Historically, it is quite doubtful whether Christ ever existed at all, and if He did we do not know anything about Him.