I have never obtained any ethical values from my scientific work.

The minority, the ruling class at present, has the schools and press, usually the Church as well, under its thumb. This enables it to organize and sway the emotions of the masses, and make its tool of them.

We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality.

Those instrumental goods which should serve to maintain the life and health of all human beings should be produced by the least possible labour of all.

Science has brought forth this danger, but the real problem is in the minds and hearts of men.

The theoretical idea ... does not arise apart from and independent of experience; nor can it be derived from experience by a purely logical procedure. It is produced by a creative act. Once a theoretical idea has been acquired, one does well to hold fast to it until it leads to an untenable conclusion.

I do not believe that a moral philosophy can ever be founded on a scientific basis. … The valuation of life and all its nobler expressions can only come out of the soul’s yearning toward its own destiny. Every attempt to reduce ethics to scientific formulas must fail. Of that I am perfectly convinced.