Rome remained great as long as she had enemies who forced her to unity, vision, and heroism. When she had overcome them all she flourished for a moment and then began to die.
Will DurantThe Islamic conquest of India is probably the bloodiest story in history. It is a discouraging tale, for its evident moral is that civilization is a precious good, whose delicate complex of order and freedom, culture and peace, can at any moment be overthrown by barbarians invading from without or multiplying within.
Will DurantHistory reports that the men who can manage men manage the men who can manage only things, and the men who can manage money manage all.
Will Durant