The total absence of humor from the Bible is one of the most singular things in all literature.

The future belongs to those who can rise above the confines of the earth.

Science repudiates philosophy. In other words, it has never cared to justify its truth or explain its meaning.

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.

The difference between ancients and moderns is that the ancients asked what have we experienced, and moderns asked what can we experience.

It is natural to think that an abstract science cannot be of much importance in affairs of human life, because it has omitted from its consideration everything of real interest.

Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.