Man's needs are infinite, and infinitude can be achieved only in the spiritual realm, never in the material.

After all, for mankind as a whole there are no exports. We did not start developing by obtaining foreign exchange from Mars or the moon. Mankind is a closed society.

Anything that we can destroy, but are unable to make is, in a sense, sacred, and all our 'explanations' of it do not explain anything.

Infinite growth of material consumption in a finite world is an impossibility.

Perhaps we cannot raise the winds. But each of us can put up the sail, so that when the wind comes we can catch it.

Not mass production but production by the masses.

An ounce of practice is generally worth more than a ton of theory.