In complex trains of thought signs are indispensable.

A cell is regarded as the true biological atom.

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.

The real people of genius were resolute workers not idle dreamers.

Not only the individual experience slowly acquired, but the accumulated experience of the race, organized in language, condensed in instruments and axioms, and in what may be called the inherited intuitions--these form the multiple unity which is expressed in the abstract term "experience.

As all Art depends on Vision, so the different kinds of Art depend on the different ways in which minds look at things.

Vehemence without feeling is but rant.