When a man wantonly destroys one of the works of man we call him a vandal. When he destroys one of the works of god we call him a sportsman.

How anyone can profess to find animal life interesting and yet take delight in reducing the wonder of any animal to a bloody mass of fur or feathers?

As machines get to be more and more like men, men will come to be more like machines.

When, in the present world, men behave well, that is no doubt sometimes because they are creatures of habit as well as, sometimes, because they are reasonable.

Custom has furnished the only basis which ethics have ever had.

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

Technology made large populations possible; large populations now make technology indispensable.