The preliminaries are the basic meditation practice - beneficial, supportive, warm-hearted, brilliant shamatha-vipashyana
practice. Shamatha-vipashyana practice is not only the earth that we stand on, it's also the air we breathe and the heart that beats inside us.
From Start Where You Are : A Guide to Compassionate Living by Pema Chodron, Copyright 1994, Shambhala Publications.
Published by arrangement with Shambhala Publications, Inc., Boston.
This site provides an on-line database of commentaries on the Tibetan Buddhist meditation practices of lojong (Mind Training) and tonglen.