We should think like this: 'May all the torments destined for me in the future, the heat and cold of the hells and the hunger and thirst of the famished spirits, come to me now. And may all the karma, obscuration and defilement causing beings to fall into an infernal destiny sink into my heart so that I myself might go to hell instead of them. May the suffering of others, the fruit, as the teachings say, of their desire and ignorance, come to me.' We should train ourselves like this again and again until we have such signs as that of Maitriyogin, who was wounded in the place where the stone had hit the dog.
Bodhicitta, the mind of enlightenment, is the heart of all the practices of the Sutra and Mantrayana, and it is easy to implement. If one has it, everything is complete, and nothing is complete without it.
From Enlightened Courage, by Dilgo Khyentse Rinpoche. Copyright 1993 by Editions Padmakara (Padmakara Translation Group). Published and distributed by Snow Lion Publications. Used by permission.
This site provides an on-line database of commentaries on the Tibetan Buddhist meditation practices of lojong (Mind Training) and tonglen.