Related but different is the benefit of the wisdom of equality. In the final stage you can work to equalize metta towards everyone. It's an antidote for the overwhelming wild cathexis of relationships. Equanimity comes from having a little distance towards your own drama.
Ratnasambhava is the bodhisattva that personifies this quality. In the icon, he reaches down toward the earth, but unlike Shakyamuni who is touching it to show who is witness to his claim to be enlightened, Ratnasambhava has his hand up in the giving mudra.