Synonyms:

karmanah–of work; su-krtasya–in the mode of goodness; ahuh–said; sattvikam–mode of goodness; nirmalam–purified; phalam–result; rajasah–of the mode of passion; tu–but; phalam–result; duhkham–misery; ajnanam–nonsense; tamasah–of the mode of ignorance; phalam–result.

Translation:

By acting in the mode of goodness, one becomes purified. Works done in the mode of passion result in distress, and actions performed in the mode of ignorance result in foolishness.