To study the meaning of man and of life — I am making significant progress here. I have faith in myself. Man is a mystery: if you spend your entire life trying to puzzle it out, then do not say that you have wasted your time. I occupy myself with this mystery, because I want to be a man.
Natural religion supplies still all the facts which are disguised under the dogma of popular creeds. The progress of religion is steadily to its identity with morals.
The population of the world is a conditional population; these are not the best, but the best that could live in the existing state of soils, gases, animals, and morals: the best that could yet live; there shall be a better, please God.
Only those young people can be accepted as healthy who refuse to be reconciled with the old order and foolishly or wisely struggle against it - such is the will of nature...
Science has given to this generation the means of unlimited disaster or of unlimited progress. There will remain the greater task of directing knowledge lastingly towards the purpose of peace and human good.