To live remains an art which everyone must learn, and which no one can teach.

No act can be quite so intimate as the sexual embrace.

Of woman as a real human being, with sexual needs and sexual responsibilities, morality has often known nothing.

The greatest task before civilization at present is to make machines what they ought to be, the slaves, instead of the masters of men.

Those persons who are burning to display heroism may rest assured that the course of social evolution will offer them every opportunity.

When love is suppressed hate takes its place.

The world's greatest thinkers have often been amateurs; for high thinking is the outcome of fine and independent living, and for that a professional chair offers no special opportunities.