The best of a book is not the thought which it contains, but the thought which it suggests; just as the charm of music dwells not in the tones but in the echoes of our hearts.

The mark of a civilized man is his willingness to re-examine his most cherished beliefs.

There is something frightful in the way in which not only characteristic qualities, but particular manifestations of them, are repeated from generation to generation.

Research and writing are lonely occupations. It is easy to become discouraged in solitary confinement.

Reason may be the lever, but sentiment gives you the fulcrum and the place to stand on if you want to move the world.

We have been cocksure of many things that were not so.

Where we stand is not as important as the direction in which we are moving.