In relation to the attainment of liberation from cyclic existence, which is known also as “definite goodness,” the role of other sentient beings is indispensable. In the Buddhist understanding, the key spiritual practices that lead to the attainment of liberation are the Three Higher Trainings—higher training in morality, in meditation, and in wisdom. The last two are based upon the foundation of the first, namely the training in morality. As I said before, the presence of other sentient beings is indispensable for this training. This is how we come to the powerful realisation that the role of other sentient beings is essential in all areas of our mundane and spiritual activities.
From Lighting the Way,pages 31-32.