Try not to become a man of success, but rather try to become a man of value.

Success is the sum of small efforts repeated day in and day out.

We must learn to distinguish between guilt and shame.

Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense.

To be happy is to be able to become aware of oneself without fright.

The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man

Persistence is what makes the impossible possible.