The step between practical and theoretic science, is the step between the miner and the geologist, the apocathecary and the chemist.

No false knight or lying priest ever prospered, I believe, in any age, but certainly not in the dark ones. Men prospered then, only in following openly-declared purposes , and preaching candidly beloved and trusted creeds.

Nothing can be true which is either complete or vacant; every touch is false which does not suggest more than it represents, and every space is false which represents nothing.

No one can do me any good by loving me; I have more love than I need or could do any good with; but people do me good by making me love them - which isn't easy.

Many thoughts are so dependent upon the language in which they are clothed that they would lose half their beauty if otherwise expressed.

I believe the first test of a truly great man is in his humility.

All the best things and treasures of this world are not to be produced by each generation for itself; but we are all intended, not to carve our work in snow that will melt, but each and all of us to be continually rolling a great white gathering snow-ball, higher and higher, larger and larger, along the Alps of human power.