Two orders of mankind are the enemies of church and state; the king without clemency, and the holy man without learning.
O wise man, wash your hands of that friend who associates with your enemies.
The whelp of a wolf must prove a wolf at last, notwithstanding he may be brought up by a man.
He, who learns and makes no use of his learning, is a beast of burden, with a load of books.
When thou seest thine enemy in trouble, curl not thy whiskers in contempt; for in every bone there is marrow, and within every jacket there is a man.
A traveler without knowledge is a bird without wings.