The man of knowledge must be able not only to love his enemies but also to hate his friends.
Quotation is a serviceable substitute for wit.
Whatever the cost of our libraries, the price is cheap compared to that of an ignorant nation.
You might be poor, your shoes might be broken, but your mind is a palace.
I did then what I knew how to do. Now that I know better, I do better.
Happiness in intelligent people is the rarest thing I know.
I am so clever that sometimes I don't understand a single word of what I am saying.