Progress has not followed a straight ascending line, but a spiral with rhythms of progress and retrogression, of evolution and dissolution.

In all times it is only individuals that have advanced science, not the age.

It is related of an Englishman that he hanged himself to avoid the daily task of dressing and undressing.

With the growth of knowledge our ideas must from time to time be organized afresh. The change takes place usually in accordance with new maxims as they arise, but it always remains provisional.

Humor is one of the elements of genius--admirable as an adjunct; but as soon as it becomes dominant, only a surrogate for genius.

Whoever strikes at marriage either by word or act undermines the foundation of all moral society.

It is ever true that he who does nothing for others, does nothing for himself." ~ Goethe