Those who staying with the wrong reward,(eg. stay in comfort zone, etc.), long enough will get problem.

Teaching should be such that what is offered is perceived as a valuable gift and not as hard duty. Never regard study as duty but as the enviable opportunity to learn to know the liberating influence of beauty in the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.

The bigotry of the nonbeliever is for me nearly as funny as the bigotry of the believer.

Without the sense of fellowship with men of like mind, of preoccupation with the objective, the eternally unattainable in the field of art and scientific research, life would have seemed to me empty.

In matters of truth and justice, there is no difference between large and small problems, for issues concerning the treatment of people are all the same.

I refuse to engage in an intellectual battle with an unarmed man.

You cannot prevent and prepare for war at the same time.