Bhagavad Gita 3.20

King Janaka and others attained perfection through action alone. Even for the sake of enlightening the world, it is your duty to act.

कर्मणैव हि संसिद्धिमास्थिता जनकादयः।
लोकसंग्रहमेवापि संपश्यन्कर्तुमर्हसि॥

karmaṇaiva hi saṃsiddhimāsthitā janakādayaḥ|
lokasaṃgrahamevāpi saṃpaśyankartumarhasi||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).