To discover to the world something which deeply concerns it, and of which it was previously ignorant; to prove to it that it had been mistaken on some vital point of temporal or spiritual interest, is as important a service as a human being can render to his fellow creatures.

The peculiarity of the evidence of mathematical truths is that all the argument is on one side.

Photography is a brief complicity between foresight and luck.

Stupidity is much the same all the world over

The bad workmen who form the majority of the operatives in many branches of industry are decidedly of opinion that bad workmen ought to receive the same wages as good.

We have hitherto considered only two possibilities: that the received opinion may be false, and some other opinion, consequently, true; or that, the received opinion being true, a conflict with the opposite error is essential to a clear apprehension and deep feeling of its truth. But there is a commoner case than either of these; when the conflicting doctrines, instead of being one true and the other false, share the truth between them.

With equality of experience and of general faculties, a woman usually sees much more than a man of what is immediately before her.