Great compassion is the source of great genuineness in the practitioner. Usually we want to cheat, to deceive, and twist things for our own sake. We distrust something or other, and feel that the situation is not quite right, so we begin to cheat or become evasive. We are trying to avoid something. But in the case of great compassion, there is no attempt to avoid anything because everything is clear. Everything is completely seen through.
From “Joining Profundity and Vastness” in The Profound Treasury of the Ocean of Dharma, Volume Two, by Chögyam Trungpa, pages 124-125