It will be found that everything depends on the composition of the forces with which the particles of matter act upon one another; and from these forces, as a matter of fact, all phenomena of Nature take their origin.

Prejudice for regularity and simplicity is a source of error that has only too often infected philosophy.

It will be found that everything depends on the composition of the forces with which the particles of matter act upon one another; and from these forces, as a matter of fact, all phenomena of Nature take their origin.

Were it not for gravity one man might hurl another by a puff of his breath into the depths of space, beyond recall for all eternity.