The distinguishing sign of slavery is to have a price, and to be bought for it.

I believe the first test of a truly great man is in his humility.

The work of science is to substitute facts for appearances, and demonstrations for impressions.

All things are literally better, lovelier, and more beloved for the imperfections which have been divinely appointed, that the law of human life may be effort, and the law of human judgment, mercy.

All really great pictures exhibit the general habits of nature, manifested in some peculiar, rare, and beautiful way.

Race is precisely of as much consequence in man as it is in any animal.

Science has to do with facts, art with phenomena. To science, phenomena are of use only as they lead to facts; and to art, facts are of use only as they lead to phenomena.