To understand via the heart is not to understand.
Tis the taste of effeminacy that disrelishes ordinary and accustomed things.
I quote others only in order the better to express myself.
I study myself more than any other subject. That is my metaphysics, that is my physics.
The profit we possess after study is to have become better and wiser.
I love a friendship that flatters itself in the sharpness and vigor of its communications.