It is not often that any man can have so much knowledge of another, as is necessary to make instruction useful.
A blade of grass is always a blade of grass, whether in one country or another.
In traveling, a man must carry knowledge with him, if he would bring home knowledge.
The great source of pleasure is variety.
I do not much wish well to discoveries, for I am always afraid they will end in conquest and robbery.
No one is much pleased with a companion who does not increase, in some respect, their fondness for themselves.