One's outlook is a part of his virtue.
None can teach admirably if not loving his task.
The traveled mind is the catholic mind educated from exclusiveness and egotism.
A good book is fruitful of other books; it perpetuates its fame from age to age, and makes eras in the lives of its readers.
Friendship is a plant that loves the sun, thrives ill under clouds.
To be ignorant of one's ignorance is the malady of the ignorant.