कर्मणः सुकृतस्याहुः सात्त्विकं निर्मलं फलम् ।
रजसस्तु फलं दुःखमज्ञानं तमसः फलम् ॥ १४.१६ ॥

karmaṇaḥ sukṛtasyāhuḥ sāttvikaṁ nirmalaṁ phalam |
rajasas-tu phalaṁ duḥkham-ajñānaṁ tamasaḥ phalam || 14.16 ||

Briefly put, good and noble actions have sāttvika and pure effect. Rajas on the other hand gives rise to grief and misery, while tāmasika actions will lead to sheer ignorance and delusion.