Persistence is the most powerful force on earth, it can move mountains.

As long as there are sovereign nations possessing great power, war is inevitable.

God may be subtle, but he isn't plain mean.

Raffiniert ist der Herr Gott, aber boshaft ist er nicht. God is subtle, but he is not malicious.

Discussion and argument are essential parts of science; the greatest talent is the ability to strip a theory until the simple basic idea emerges with clarity.

The only thing we can be certain of in this life is that we can be certain of nothing.

Your fervent wishes can only find fulfillment if you succeed in attaining love and understanding of men, and animals, and plants, and stars, so that every joy becomes your joy and every pain your pain.