When the history of civilization is written, it will be a biological history and Margaret Sanger will be its heroine.

All men, however highly educated, retain some superstitious inklings.

He began to realize that you cannot even fight happily with creatures that stand upon a different mental basis to yourself.

We are kept keen on the grindstone of pain and necessity.

A time will come when men will sit with history before them or with some old newspaper before them and ask incredulously,"Was there ever such a world?"

Strength is the outcome of need; security sets a premium on feebleness. The work of ameliorating the conditions of life -- the true civilizing process that makes life more and more secure -- had gone steadily on to a climax... And the harvest was what I saw.

Losing your way on a journey is unfortunate. But, losing your reason for the journey is a fate more cruel.