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

Our task - and the task of all education - is to understand the present world, the world in which we live and make our choices.

The richer a society, the more impossible it becomes to do worthwhile things without immediate pay-off.

Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction.

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

The system of nature, of which man is a part, tends to be self-balancing, self-adjusting, self-cleansing. Not so with technology.

There can be nothing sacred in something that has a price.