Time, whose tooth gnaws away everything else, is powerless against truth

Ecclesiasticism in science is only unfaithfulness to truth

Freedom and order are not incompatible... truth is strength... free discussion is the very life of truth.

Time, whose tooth gnaws away everything else, is powerless against truth.

The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.

The doctrine that all men are, in any sense, or have been, at any time, free and equal, is an utterly baseless fiction