The Doctrine of Evolution states the fact that the present is the child of the past and the parent of the future.

The man who has grit enough to bring about the afforestation or the irrigation of a country is not less worthy of honor than its conqueror.

There is no counting the unsolved problems of Natural History.

A prolonged war in which a nation takes part is bound to impoverish the breed, since the character of the breed depends on the men who are left.

The most powerful factors in the world are clear ideas in the minds of energetic men of good will.

The chief end of science is to make things clear, the educative aim is to foster the inquisitive spirit.

Was it not the great philosopher and mathematician Leibnitz who said that the more knowledge advances the more it becomes possible to condense it into little books?