Have no regard for conducive or adverse conditions, strong or weak health, wealth or poverty, good or bad reputation, troubles or absence of troubles. If conducive conditions come about, train the mind right then. If conducive conditions are not present, then work on the two bodhicittas
right then. In a word, don't be concerned with your situation or other factors; never let go of your practice of mind training.
From The Great Path of Awakening : An Easily Accessible Introduction for Ordinary People by Jamgon Kongtrul, translated by Ken McLeod. Copyright 1993 by Ken McLeod.
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.