Francois de La Rochefoucauld

Old age is a tyrant, who forbids, under pain of death, the pleasures of youth.

Some people displease with merit, and others' very faults and defects are pleasing.

Perfect courage is to do without witnesses what one would be capable of doing with the world looking on.

A teacher must believe in the value and interest of his subject as a doctor believes in health.

Doubt is part of all religion. All the religious thinkers were doubters.

But with each passing year and each new study, the evidence for the genetic contribution to individual and group differences becomes more firmly established than ever.