The difference between stupidity and genius is that genius has its limits.

Almost all the other fellows do not look from the facts to the theory but from the theory to the facts; they cannot get out of the network of already accepted concepts; instead, comically, they only wriggle about inside.

Time is relative; its only worth depends upon what we do as it is passing.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. He to whom the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.

What a person thinks on his own without being stimulated by the thoughts and experiences of the other people is even in the best case rather paltry and monotonous.

The thing is, not to stop questioning.

Dear Posterity, If you have not become more just, more peaceful, and in general more sensible... then may the Devil take you!