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.

The solitude and peace of mind are serving me quite well, not the least of which is due to the excellent and truly enjoyable relationship with my cousin; its stability will be guaranteed by the avoidance of marriage.

I like neither new clothes nor new kinds of food.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

The formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.

Earnestly I must exert myself in order to return as much as I have received.

It is open to every man to choose the direction of his striving; and also every man may draw comfort from Lessing's fine saying, that the search for truth is more precious than its possession.