Happy the man who early learns the wide chasm that lies between his wishes and his powers.
One must ask children and birds how cherries and strawberries taste.
Every solution of a problem is a new problem.
By seeking and blundering we learn.
Live dangerously and you live right.
God could cause us considerable embarrassment by revealing all the secrets of nature to us: we should not know what to do for sheer apathy and boredom.