All these constructions and the laws connecting them can be arrived at by the principle of looking for the mathematically simplest concepts and the link between them.

I wouldn't want to live if I did not have my work. In any case, it's good that I'm already old and personally don't have to count on a prolonged future.

Love is a better teacher than duty.

Without the sense of fellowship with men of like mind... life would have seemed to me empty.

The true value of a human being can be found in the degree to which he has attained liberation from the self.

I am content in my later years. I have kept my good humor and take neither myself nor the next person seriously.

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.