All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.

To accomplish great things, we must dream as well as act.

The wonder is, not that the field of stars is so vast, but that man has measured it.

To accomplish great things, we must not only act, but also dream; not only plan, but also believe.

The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards.

Wandering re-establishes the original harmony which once existed between man and the universe.

When a thing has been said and well, have no scruple. Take it and copy it.

Devout believers are safeguarded in a high degree against the risk of certain neurotic illnesses; their acceptance of the universal neurosis spares them the task of constructing a personal one.

Awaken people's curiosity. It is enough to open minds, do not overload them. Put there just a spark.