What are the key emotions every actor should master?

By master, I mean understand intuitively, experientially, and in every other way the actor is capable of. If possible, the mastery should be so deep, that not only can the actor recreate them realistically at will, but he can also prevent them for overwhelming him in real life, and he can also sense them accurately in others. This is, I think (if i'm not mistaken) a form of empathy, but, for the actor, with greater abilities than merely sensing emotions.