One key doesn’t open every lock and there is no one way to get people to cooperate – it takes a different key to unlock people.

Sometimes it’s not even a key, but a FOB.  Assuming that one way to win cooperation from any someone will work on everyone will lead to disappointment.  Every person requires different things.  So the idea is not to use a master key to get the best out of people but to carry around a bunch of keys that will inspire others to follow you.