To understand art is to understand life.
The highest manifestation of life consists in this: that a being governs its own actions.A thing which is always subject to the direction of another is somewhat of a dead thing.
Mathematics is not a spectator sport—you have to engage with it to appreciate its beauty.
Never stop learning; the moment you do, you stop growing.
Psychological theories must pass the test of practical experience.
We are all fools in love.
When you have something to say, silence is a lie.