The next verse refers to the three objects: agreeable, disagreeable, and neutral objects. As we relate to these three types of objects, the three mental poisons arise: attachment, hostility, and confusion. The point is to use these poisons as opportunities to nurture the roots of virtue.
As we engage in the affairs of daily fife, as soon as we become aware that attachment, craving, or clinging has arisen, right then is the time to recognize that there are an immeasurable number of sentient beings who are subject to the same mental afflictions. Expand your awareness of this right on the spot, and let the aspiration arise: "May those countless sentient beings be endowed with the root of virtue that is freedom from attachment. May they be free of this attachment that I am now experiencing." The aspiration itself is a root of virtue.
Similarly, in moments of anger, simply recognize the anger as it arises. This presents a way for those of us with a dharma friend or spouse to help each other. Provided the anger is not directed at the other person, when one flies off the handle the other can simply say, "Anger has arisen." This can, if not vanquish the anger, at least snap us halfway out of its craziness. The anger presents us also with the opportunity, once we have recognized it, to recognize also that there are innumerable sentient beings who, like ourselves, are subject to anger. And so let the aspiration arise: "May they be endowed with the root of virtue of freedom from anger." We can likewise apply the same practice to the third poison, confusion or ignorance. This is truly a practice for our daily life.
Excerpted from: The Seven-Point Mind Training(first published as A Passage from Solitude : Training the Mind in a Life Embracing the World), by B. Alan Wallace. Copyright 1992 by Snow Lion Publications, Ithaca, New York 14851.
This site provides an on-line database of commentaries on the Tibetan Buddhist meditation practices of lojong (Mind Training) and tonglen.