No man is matriculated to the art of life till he has been well tempted.

There is nothing I should care more to do, if it were possible, than to rouse the imagination of men and women to a vision of human claims in those races of their fellow-men who most differ from them in customs and beliefs.

Life is very difficult. It seems right to me sometimes that we should follow our strongest feelings; but then such feelings continually come across the ties that all our former life has made for us,--the ties that have made others dependent on us,--and would cut them in two.

What loneliness is more lonely than distrust?

Resolve will melt no rocks. But it can scale them.

Of what use, however, is a general certainty that an insect will not walk with his head hindmost, when what you need to know is the play of inward stimulus that sends him hither and thither in a network of possible paths?

there are two ways of speaking an audience will always like: one is, to tell them what they don't understand; and the other is, to tell them what they're used to.