Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 13
Sanskrit:
वृत्तिर्भूतानि भूतानां चराणामचराणि च ।कृता स्वेन नृणां तत्र कामाच्चोदनयापि वा ॥ १३ ॥
ITRANS:
vṛttir bhūtāni bhūtānāṁcarāṇām acarāṇi cakṛtā svena nṛṇāṁ tatrakāmāc codanayāpi vā
Translation:
Vṛtti means the process of sustenance, by which the moving beings live upon the nonmoving. For a human, vṛtti specifically means acting for one’s livelihood in a manner suited to his personal nature. Such action may be carried out either in pursuit of selfish desire or in accordance with the law of God.