Science is simply common sense at its best.

No one can help another very much in these crises of life; but love and sympathy count for something.

The best men of the best epochs are simply those who make the fewest blunders and commit the fewest sins.

A man's worst difficulties begin when he is able to do as he likes.

I believe that history might be, and ought to be, taught in a new fashion so as to make the meaning of it as a process of evolution intelligible to the young.

The whole analogy of natural operations furnishes so complete and crushing an argument against the intervention of any but what are termed secondary causes, in the production of all the phenomena of the universe; that, in view of the intimate relations between Man and the rest of the living world; and between the forces exerted by the latter and all other forces, I can see no excuse for doubting that all are co-ordinated terms of Nature's great progression, from the formless to the formed from the inorganic to the organic from blind force to conscious intellect and will.

It is better to read a little and thoroughly than cram a crude undigested mass into my head, though it be great in quantity.