"A wise ruler ought never to keep faith when by doing so it would be against his interests"

This quote by Machiavelli suggests that an excellent leader ought to not always be bound by their promises and commitments if it breaks their own interests. Machiavelli thought that leaders need to prioritize their own power and success, even if it suggests breaking their word. This view is often described as "Machiavellianism" and has been questionable in ethics and politics.