Animals are such agreeable friends - they ask no questions they pass no criticisms.

The reward of one duty is the power to fulfill another.

Science is properly more scrupulous than dogma. Dogma gives a charter to mistake, but the very breath of science is a contest with mistake, and must keep the conscience alive.

Wear a smile and have friends wear a scowl and have wrinkles.

And when a woman's will is as strong as the man's who wants to govern her, half her strength must be concealment.