Empires do not suffer emptiness of purpose at the time of their creation. It is when they have become established that aims are lost and replaced by vague ritual.

A leader is one of the things that distinguishes a mob from a people. He maintains the level of individuals. Too few individuals and a people reverts to a mob.

To endure oneself may be the hardest task in the universe.

No more terrible disaster could befall your people than for them to fall into the hands of a Hero.

Law of the Minimum: "The worst potential competition for any organism can come from its own kind. The species consumes necessities. Growth is limited by that necessity which is present in the least amount. The least favourable condition controls the rate of growth."

A good companion is one you wouldn't mind dying with.

Once human beings realize something can be done, they're not satisfied until they've done it.