Obedience alone gives the right to command.

The reason why any one refuses his assent to your opinion, or his aid to your benevolent design, is in you: he refuses to accept you as a bringer of truth, because, though you think you have it, he feels that you have it not. You have not given him the authentic sign.

Science does not know its debt to imagination.

Build a better mousetrap and the world will beat a path to your door.

Whenever a mind is simple and receives an old wisdom, old things pass away,--means, teachers, texts, temples fall; it lives now, and absorbs past and future into present hour. All things are made sacred by relation to it,--one as much as another.

I remember an answer which when quite young I was prompted to make a valued adviser who was wont to importune me with the dear old doctrines of the church. On my saying, What have I to do with the sacredness of traditions, if I live wholly from within? my friend suggested, - "But these impulses may be from below, not from above." I replied, 'They do not seem to me to be such; but if I am the devil's child, I will live then from the devil.'

What I must do is all that concerns me, not what the people think. This rule, equally arduous in actual and in intellectual life, may serve for the whole distinction between greatness and meanness.