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.
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.
Our words must be judged by our deeds; and in striving for a lofty ideal we must use practical methods; and if we cannot attain all at one leap, we must advance towards it step by step, reasonably content so long as we do actually make some progress in the right direction.