Verses 19-21 of 27 Verses on Mind Training

19) Transform the intense activity of daily life into the harmonious expression and teaching of truth by affectionately reminding and being reminded that the bitter dark fruits of negating others are poisonous, to be most carefully avoided, while the sweet bright fruits of affirming others are life-giving, to be thoroughly enjoyed. Authentic delight exists only in serving others, and suffering springs only from harming others or insensitively ignoring the needs of living beings, all of whom are as intimately related to us as our own precious mother and father.  

20) So sensitive an ecology is the interdependence of all, that the slightest attention and assistance to others creates moral elevation for ourselves and humanity, while the slightest indifference or neglect toward others creates moral harm for ourselves and our civilization. The faintest spark of ill will toward other beings can burst forth into a terrible forest fire, consuming vast expanses of sympathetic joy. Even the faintest negative reaction or malicious wish opens wide channels throughout our entire being for life-destroying poisons of negation and life-obscuring shadows of self-cherishing. 

21) Cast far away from all precious humanity these lethal doses, these ominous shadows, by cultivating instinctive admiration and love for those who practice the way of selflessness. Adore such bodhisattvas for their irreversible vow to remain intimate with the struggle of living beings as beacons of love and as the light of panoramic vision. 

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.