Bhagavad Gita · 18.46

यतः प्रवृत्तिर्भूतानां येन सर्वमिदं ततम्।स्वकर्मणा तमभ्यर्च्य सिद्धिं विन्दति मानवः॥

yataḥ pravṛittir bhūtānāṁ yena sarvam idaṁ tatam sva-karmaṇā tam abhyarchya siddhiṁ vindati mānavaḥ

By worshipping through one's own duty the One from whom all beings originate and by whom all this is pervaded, a person attains perfection.

— Bhagavad Gita 18.46

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)