The man who is in the highest state of prosperity, and who thinks his fortune is most secure, knows not if it will remain unchanged till the evening.
DemosthenesIt is not possible to found a lasting power upon injustice, perjury, and treachery. These may, perhaps, succeed for once, and borrow for awhile, from hope, a gay and flourishing appearance. But time betrays their weakness, and they fall into ruin of themselves. For, as in structures of every kind, the lower parts should have the greatest firmness--so the grounds and principles of actions should be just and true.
Demosthenes