All great authors are seers.

Every one who has seriously investigated a novel question, who has really interrogated Nature with a view to a distinct answer, will bear me out in saying that it requires intense and sustained effort of imagination.

In all sincere speech there is power, not necessarily great power, but as much as the speaker is capable of.

Speak for yourself and from yourself, or be silent.

Heart and Brain are the two lords of life. In the metaphors of ordinary speech and in the stricter language of science, we use these terms to indicate two central powers, from which all motives radiate, to which all influences converge.

There are many justifications of silence; there can be none of insincerity.

Many a genius has been slow of growth. Oaks that flourish for a thousand years do not spring up into beauty like a reed.