If you want a wise answer, ask a reasonable question.

The errors of the observer come from the qualities of the human mind.

Daring ideas are like chessmen moved forward; they may be beaten, but they may start a winning game.

The world is so great and rich, and life so full of variety, that you can never lack occasions for poems.

When ideas fail, words come in very handy.

Superstition is rooted in a much deeper and more sensitive layer of the psyche than skepticism.

Whether one show one's self a man of genius in science or compose a song, the only point is, whether the thought, the discovery, the deed, is living and can live on.