Without continual growth and progress, such words as improvement, achievement, and success have no meaning.

The more we realize our minuteness and our impotence in the face of cosmic forces the more astonishing becomes what human beings have achieved.

Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence.

Noise proves nothing. Often a hen who has merely laid an egg cackles as if she had laid an asteroid.

Failures are finger posts on the road to achievement.

Be more dedicated to making solid achievements than in running after swift but synthetic happiness.