(A ruler) cannot and should not keep his word when to do so would go against his interests or when the reason he pledged it no longer holds.
Niccolo MachiavelliWhoever is the cause of another becoming powerful, is ruined himself; for that power is produced by him either through craft or force; and both of these are suspected by the one who has been raised to power.
Niccolo MachiavelliHe who makes war his profession cannot be otherwise than vicious. War makes thieves, and peace brings them to the gallows.
Niccolo Machiavelli