One can know nothing of giving aught that is worthy to give unless one also knows how to take.

The place where optimism most flourishes is the lunatic asylum.

It is becoming clear that the old platitudes can no longer be maintained, and that if we wish to improve our morals we must first improve our knowledge.

What we call progress is the exchange of one nuisance for another nuisance.

The Promised Land always lies on the other side of a Wilderness.

Every man of genius sees the world at a different angle from his fellows, and there is his tragedy.

The sexual regions constitute a particularly vulnerable spot, and remain so even in man, and the need for their protection which thus exists conflicts with the prominent display required for sexual allurement. This end is far more effectively attained, with greater advantage and less disadvantage, by concentrating the chief ensigns of sexual attractiveness on the upper and more conspicuous parts of the body. This method is well-nigh universal among animals as well as in man.