Boys naturally look on all force as an enemy.

Laplace would have found it child's-play to fix a ratio of progression in mathematical science between Descartes, Leibnitz, Newton and himself

Analogies are figures intended to serve as fatal weapons if they succeed, and as innocent toys if they fail.

There is no such thing as an underestimate of average intelligence.

The difference is slight, to the influence of an author, whether he is read by five hundred readers, or by five hundred thousand; if he can select the five hundred, he reaches the five hundred thousand.

Boys naturally look on all force as an enemy.

All experience is an arch, to build upon.