Quotes from Isaac Asimov, Foundation

Weak emperors mean strong viceroys.

Never let your sense of morals prevent you from doing what is right.

In the empty expanses of space, the wandering traders need men like myself to care for the spiritual side of a life so given over to commerce, and worldly pursuits.

Somewhere on the world was the Emperor's palace, set amid one hundred square miles of natural soil, rainbowed with flowers.