The philosophies of one age have become the absurdities of the next, and the foolishness of yesterday has become the wisdom of tomorrow.
It is not as if our homeopathic brothers are asleep: far from it, they are awake - many of them at any rate - to the importance of the scientific study of disease.
The teacher's life should have three periods, study until twenty-five, investigation until forty, profession until sixty, at which age I would have him retired on a double allowance.
The uselessness of men above sixty years of age and the incalculable benefit it would be in commercial, in political, and in professional life, if as a matter of course, men stopped work at this age.
Take the sum of human achievement in action, in science, in art, in literature subtract the work of the men above forty, and while we should miss great treasures, even priceless treasures, we would practically be where we are today ... The effective, moving, vitalizing work of the world is done between the ages of twenty-five and forty.
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