Life is a series of lessons that have to be understood.

Be not a slave of words.

The hell of these days is the fear of not getting along, especially of not making money.

To say that we have a clear conscience is to utter a solecism; had we never sinned we should have had no conscience. Were defeat unknown, neither would victory be celebrated by songs of triumph.

A man's perfection is his work.

Out of the lowest depths there is a path to the loftiest heights.

The man who cannot wonder, who does not habitually wonder (and worship), were he President of innumerable Royal Societies, and carried the whole Mecanique Celeste and Hegel's Philosophy, and the epitome of all Laboratories and Observatories with their results, in his single head, is but a Pair of Spectacles behind which there is no Eye. Let those who have Eyes look through him, then he may be useful.