Truth is better disengaged from error than torn from it.

Boundaries which mark off one field of science from another are purely artificial, are set up only for temporary convenience. Let chemists and physicists dig deep enough, and they reach common ground.

A man's own addition to what he learns is cement to bind an otherwise loose heap of stones into a structure of unity, strength, and use.

Nothing cools so fast as undue enthusiasm. Water that has boiled freezes sooner than any other.

Ignorance may find a truth on its doorstep that erudition vainly seeks in the stars.

Let truth be a banner big enough to hide the man who holds it up.

A tree nowhere offers a straight line or a regular curve, but who doubts that root, trunk, boughs, and leaves embody geometry?