"It is not good for man to be alone; and I say it is not good for him to be a philosopher."

"The truth is not in books, but in nature."

"The most dangerous of all enterprises is to make a man think."

"All my misfortunes come from my having loved too much, and having been too much loved."

"To write a good love letter, you ought to begin without knowing what you mean to say, and to finish without knowing what you have said."