No matter how brief our thought of loving-kindness — even if we utter only a single mantra with devotion — we should dedicate it to the cause of boundless benefits for infinite mother-beings and rejoice over it. Even if our virtuous deed seems small, if we repeatedly rejoice inwardly over it for days or weeks on end, the merits of this deed will continue to grow like the Mississippi River in the summer, and may even become inexhaustible.

-- Tulku Thondup Rinpoche