Gray are all the theories, But green is the tree of life.

There is nothing in life so irrational, that good sense and chance may not set it to rights; nothing so rational, that folly and chance may not utterly confound it.

Ignorant men raise questions that wise men answered a thousand years ago.

There are situations in which hope and fear run together, in which they mutually destroy one another and lose themselves in dull indifference.

Men are joined by conviction, sundered by opinion.

Wind is the loving Wooer of waters; Wind blends together Billows all-foaming. Spirit of man, Thou art like unto water! Fortune of man, Thou art like unto wind!

The history of science is science itself; the history of the individual, the individual.