Those who know gratitude,
even while in the cycle of birth and death,
will keep intact their roots of virtue.
Those who do not know gratitude
ruin their roots of virtue and accumulate unwholesome karma.
Therefore, the Tathagatas praise the grateful and reprove the ungrateful,
and always rescue all beings from suffering, moved by compassion.
—Buddha Shakyamuni, Mahavaipulya Sutra of the Inconceivable State of Tathagatas