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

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

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.

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?

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

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.

There is no counting the unsolved problems of Natural History.

Everything that looks too perfect is too perfect to be perfect.

The beauty of life does not reside in certainty or conformity. It resides in the infinite possibilities of uncertainty.

To shape a dream well, understand that it is going to happen through processes in which your hands must get on board. It takes your own responsibility to get the best dream shape

…most of the damage we cause to the planet is the result of our own ignorance.

Beer dulls a memory, brand sets it burning, but wine is the best for a sore heart's yearning.

Be careful what you give children, for sooner or later you are sure to get it back.

I am in truth the Steppenwolf that I often call myself; that beast astray that finds neither home nor joy nor nourishment in a world that is strange and incomprehensible to him.

Every event that a man would master must be mounted on the run, and no man ever caught the reins of a thought except as it galloped past him.

Heaven on Earth is a choice you must make, not a place you must find.

God defend me from that Welsh fairy, Lest he transform me to a piece of cheese!