The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers.

The brain is not a passive recipient of stimuli but an active organizer of perception.

如果我们能找到自然的弱点，就能征服它。

I don't want to be a symbol, I want to be myself.

To feed the world, we must first learn to respect the limits of our planet.

富人和你我不同——他们钱更多，同情心更少。