Demonstration is also something necessary, because a demonstration cannot go otherwise than it does, ... And the cause of this lies with the primary premises/principles.
AristotleA king ruleth as he ought, a tyrant as he lists, a king to the profit of all, a tyrant only to please a few.
AristotleIt is easy to perform a good action, but not easy to acquire a settled habit of performing such actions.
Aristotle