It requires a very unusual mind to undertake the analysis of the obvious.

The aims of scientific thought are to see the general in the particular and the eternal in the transitory.

The real history does not get written, because it is not in people's brains but in their nerves and vitals.

One main factor in the upward trend of animal life has been the power of wandering.

Education with inert ideas is not only useless; it is above all things harmful.

The factor in human life provocative of a noble discontent is the gradual emergence of a sense of criticism, founded upon appreciation of beauty, and of intellectual distinction, and of duty.

Speech is human nature itself, with none of the artificiality of written language.