Skandapurana 17.9.16

17.9.16

yadā te tāmasaiḥ kāryaṃ tadā raudro bhava svayam ..
yadā te rājasaiḥ kāryaṃ tadā tvaṃ rājaso bhava..
sāttvikaiste yadā kāryaṃ tadā tvaṃ sāttviko bhava ..16..

When your work is through those of darkness, then be yourself fierce; / when your work is through those of passion, then be passionate; / when your work is through those of goodness, then be full of goodness.