The great achievements of the past were the adventures of the past. Only the adventurous can understand the greatness of the past.

Do not teach too many subjects and what you teach, teach thoroughly.

It is impossible to meditate on time and the mystery of nature without an overwhelming emotion at the limitations of human intelligence.

A Unitarian is a person who believes in at most one God.

The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.

It does not matter what men say in words, so long as their activities are controlled by settled instincts. The words may ultimately destroy the instincts; but until this has occurred, words do not count.

In the history of the world the prize has not gone to those species which specialized in methods of violence, or even in defensive armor. In fact, nature began with producing animals encased in hard shells for defense against the ill of life. But smaller animals, without external armor, warm-blooded, sensitive, alert, have cleared those monsters off the face of the earth.