Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Moksha-Sanyasa Yoga Chapter 18, Verse 18.48.
Sanskrit
सहजं कर्म कौन्तेय सदोषमपि न त्यजेत् । सर्वारम्भा हि दोषेण धूमेनाग्निरिवावृताः ॥ १८.४८ ॥
Hindi
अतएव हे कुन्ती पुत्र ! दोष युक्त्त होने पर भी सहज कर्म को नहीं त्यागना चाहिये ; क्योंकि धुऍ से अग्नि की भाँति सभी कर्म किसी न किसी दोष से युक्त्त हैं ।
English
A man should never foresake his own tasks, even if he cannot complete them in full perfection, simply because it is a known fact that every (human) endeavour consists of some fault or imperfection just as all fire consists of smoke.