Nature has given us two ears but only one mouth.
Scientific, like spiritual truth, has ever from the beginning been descending from heaven to man.
You asked me where I generally lived. In my workshop [i.e. in his study] in the mornings and always in the library in the evening. Books are companions even if you donโt open them.
The disappointment of manhood succeeds the delusion of youth.
Friendship is the gift of the gods, and the most precious boon to man.
As for our majority... one is enough.