Bhagavad Gita 14.16

14.16 The fruit of good action, they say, is Sattvic and pure, verily the fruit of Rajas is pain, and ignorance is the fruit of Tamas.

The result of pious action is pure and is said to be in the mode of goodness. But action done in the mode of passion results in misery, and action performed in the mode of ignorance results in foolishness.