One verse

Srimad Bhagavatam 7.11.32

7.11.32

वृत्त्या स्वभावकृतया वर्तमान: स्वकर्मकृत् । हित्वा स्वभावजं कर्म शनैर्निर्गुणतामियात् ॥ ३२ ॥

vrttya sva-bhava-krtaya vartamanah sva-karma-krt hitva sva-bhava-jam karma sanair nirgunatam iyat

vrttya
with the profession
sva-bhava-krtaya
performed according to one’s modes of material nature
vartamanah
existing
sva-karma-krt
executing his own work
hitva
giving up
sva-bhava-jam
born from one’s own modes of nature
karma
activities
sanaih
gradually
nirgunatam
transcendental position
iyat
may attain.

If one acts in his profession according to his position in the modes of nature and gradually gives up these activities, he attains the niskama stage.