All truth, in the long run, is only common sense clarified.
Books are the money of Literature, but only the counters of Science.
Ecclesiasticism in science is only unfaithfulness to truth.
Economy does not lie in sparing money, but in spending it wisely.
Every great advance in natural knowledge has involved the absolute rejection of authority.
Freedom and order are not incompatible… truth is strength… free discussion is the very life of truth.
History warns us that it is the customary fate of new truths to begin as heresies and to end as superstitions.
I believe that history might be, and ought to be, taught in a new fashion so as to make the meaning of it as a process of evolution intelligible to the young.
I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men.
If a little knowledge is dangerous, where is the man who has so much as to be out of danger?
If a man cannot do brain work without stimulants of any kind, he had better turn to hand work it is an indication on Nature’s part that she did not mean him to be a head worker.
In science, as in art, and, as I believe, in every other sphere of human activity, there may be wisdom in a multitude of counsellors, but it is only in one or two of them.
In scientific work, those who refuse to go beyond fact rarely get as far as fact.
It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organization upon the natural organization of the body.
It is one of the most saddening things in life that, try as we may, we can never be certain of making people happy, whereas we can almost always be certain of making them unhappy.
My business is to teach my aspirations to confirm themselves to fact, not to try and make facts harmonize with my aspirations.
My experience of the world is that things left to themselves don’t get right.
No delusion is greater than the notion that method and industry can make up for lack of mother-wit, either in science or in practical life.
No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man.
Of moral purpose I see no trace in Nature. That is an article of exclusively human manufacture and very much to our credit.