I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.

When the sun is covered by clouds, objects are less conspicuous, because there is little difference between the light and shade of the trees and the buildings being illuminated by the brightness of the atmosphere which surrounds the objects in such a way that the shadows are few, and these few fade away so that their outline is lost in haze.

Putting your hand into a river, you simultaneously touch the last of what is passing and the first of what is coming.

The cat is nature's masterpiece.

Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.

Whoever in debate quotes authority uses not intellect, but memory.

People reveal themselves completely only when they are thrown out of the customary conditions of their life.