Buddha certainly glorified the worth of compassion, but he also glorified the worth of insight. He never said that universal compassion could alone bring one to Nirvana. Buddha recommended the first as a disciplinary practice for the attainment of the other. Why? Because personal feeling either blinds us to truth or distorts our mentality. Often we cannot see things as they really are because we are warped by our egoistic prejudices and passions. If we can get away from the personal, we can get rid of these obstacles. Compassion thins the ego's strength and assists us to become properly equipped to achieve insight into Truth. Similarly, Jesus gave the masses the golden rule of doing unto one's neighbour as one would be done by. They needed to be dislodged from their strong selfishness. Hence, he taught them that "Whatsoever you sow that shall you also reap" but he did not suggest that this was sufficient guidance to the Kingdom of Heaven. Love is not enough.
-- Notebooks Category 16: The Sensitives > Chapter 2: Phases of Mystical Development > # 62