A stand can be made against invasion by an army; no stand can be made against invasion by an idea.

Every bird which flies has the thread of the infinite in its claw. Germination includes the hatching of a meteor and the tap of a swallow's bill breaking the egg, and it leads forward the birth of an earth-worm and the advent of Socrates.

Thought is the labor of the intellect, reverie is its pleasure.

Where no plan is laid, where the disposal of time is surrendered merely to the chance of incident, chaos will soon reign.

Let us leave to the brain what belongs to it, and agree that the work of the men of genius is of the superhuman, the offspring of man.

Even the darkest night will end and the sun will rise.

Reason is intelligence taking exercise. Imagination is intelligence with an erection.