A garden requires patient labor and attention. Plants do not grow merely to satisfy ambitions or to fulfill good intentions. They thrive because someone expended effort on them.

There is no excellence without labor. One cannot dream oneself into either usefulness or happiness.

One's happiness depends less on what he knows than on what he feels.

Anyone who acquires more than the usual amount of knowledge concerning a subject is bound to leave it as his contribution to the knowledge of the world.

Science may eventually explain the world of How. The ultimate world of Why may remain for contemplation, philosophy, religion.