Chapter 18 - Verse 45

स्वे स्वे कर्मण्यभिरतः संसिद्धिं लभते नरः ।
स्वकर्मनिरतः सिद्धिं यथा विन्दति तच्छृणु ॥ ४५ ॥

sve sve karmaṇyabhirataḥ saṃsiddhiṃ labhate naraḥ .
svakarmanirataḥ siddhiṃ yathā vindati tacchṛṇu .. 45 ..


Devoted each to his own duty, man attains perfection; how one, devoted to one’s own duty, attains success, that do thou hear.
Read the commentary

Each to his own duty : as ordained according to his nature. Man : he who is qualified (for Karma-Yoga). Perfection (samsiddhi) : which consists in the body and senses being qualified for the devotion of knowledge (jnana-nishtha) after all their impurities have been washed away by the performance of one’s own duty.—Can this perfection be attained directly by the mere performance of one’s own duty †?—No.—How then?—Learn how it can be attained :

The questioner understands ‘perfection’ in the sense of absolute perfection i. e., Moksha. It is, of course, impossible to attain Moksha by works alone.—A.