“The point I wish to make here is that the practice of compassion is at the heart of the entire path. All other practices are either preliminary to it, or a foundation for it, or they are subsequently applications of this core practice. I would also like to point out that there is a consensus between all Buddhist schools on this in both Mahayana and non-Mahayana traditions. So compassion lies at the root of all the Buddha’s teaching, but it is within the bodhisattva ideal that we find special emphasis on the concerted development of compassion by means of cultivating bodhichitta.”
elaborate?