The Jewel in the Crown Sutra states, "Donning the armor of loving-kindness, while abiding in the state of great compassion, practice meditative stabilization that actualizes the emptiness possessing the best of all qualities. What is the emptiness possessing the best of all qualities? It is that which is not divorced from generosity, ethics, patience, effort, meditative stabilization, wisdom, or skillful means." Bodhisattvas must rely on virtuous practices like generosity as means to thoroughly ripen all sentient beings and in order to perfect the place, body, and manifold retinue.
--from Stages of Meditation by Kamalashila