The whole of theology, in regard to hell no less than to heaven, takes it for granted that Man is what is of most importance in the Universe of created beings. Since all theologians are men, this postulate has met with little opposition.

In considering irregular appearances, there are certain very natural mistakes which must be avoided.

So far I have been speaking of theoretical science, which is an attempt to understand the world. Practical science, which is an attempt to change the world, has been important from the first, and has continually increased in importance, until it has almost ousted theoretical science from men's thoughts.

It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition.

Conquer the world by intelligence, and not merely by being slavishly subdued by the terror that comes from it.

Happiness, as is evident, depends partly upon external circumstances and partly upon oneself.

Neither the Church nor modern public opinion condemns petting, provided it stops short at a certain point.