Moral epochs have their course as well as the seasons. We can no more hold them fast than we can hold sun, moon, and stars. Our faults perpetually return upon us; and herein lies the subtlest difficulty of self-knowledge.

Every step of life shows much caution is required.

All truths are old, and all that we have to do is recognize and utter them anew.

Everything factual is, in a sense, theory. The blue of the sky exhibits the basic laws of chromatics. There is no sense in looking for something behind phenomena: they are theory.

It seems to me that every phenomenon, every fact, itself is the really interesting object. Whoever explains it, or connects it with other events, usually only amuses himself or makes sport of us, as, for instance, the naturalist or historian. But a single action or event is interesting, not because it is explainable, but because it is true.

Win for yourself that which your fathers have won.

One must keep repeating the Truth.