" Sometimes, visualize that your heart is a brilliant ball of light. As you breathe out, it radiates rays of white light in all directions, carrying your happiness to all beings. As you breathe in, their suffering, negativity and afflictions come towards you in the form of dense, black light, which is absorbed in your heart and disappears in its brilliant white light without a trace, relieving all beings of their pain and sorrow. "

― Dilgo Khyentse , The Heart of Compassion: The Thirty-seven Verses on the Practice of a Bodhisattva