Playfullness is the essential feature of productive thought.
I am enough of an artist to draw freely upon my imagination.
The field is the sole influence of the particle.
A man must learn to understand the motives of human beings, their illusions, and their sufferings.
Culture in its higher forms is a delicate plant which depends on a complicated set of conditions and is wont to flourish only in a few places at any given time.
Experience alone can decide on truth.