Verses 13-15 of 27 Verses on Mind Training
13) To remember vividly during every moment the kindness that has been expressed by all beings, and to cultivate an intense and constant longing to return even a small portion of this kindness, unveils the true significance of life in all worlds. The person who fails to respond wholeheartedly to this call for universal kindness and concern is on a lower plane of development than animals, whom are capable of experiencing immense gratitude.
14) Those who unhesitatingly embrace and tenderly serve all suffering creatures during this degenerate age, just as a loving mother painstakingly cares for even the most wayward of her children, they alone are the teachers of the holy life who authentically walk the Buddha Way.
15) The mind that faithfully and tirelessly serves and elevates conscious beings is sheer goodness, constantly giving the gift of itself, its faith in ever-expanding goodness, to all other minds thereby benefiting them in the most direct way. Of all possible forms of benefit on any level, the highest is to teach this practice of love, this indomitable faith in universal goodness, by the direct transmission of selfless awareness flowing transparently from mind to mind in accordance with the need and capacity of each mind. This is true teaching, tangibly transmitting the living energy of universal goodness, which becomes perpetually active in the recipient, even during the most pressing times of crisis, never evaporating into mere words or concepts.
Source: Translation is from the following book: Hixon, Lex. Mother of the Buddhas: Meditation on the Prajnaparamita Sutra. Foreword by Robert A. E. Thurman Ph.D. Wheaton, Illinois: Quest Books, 1993.