Bhagavad Gita 4.19
The wise call him a sage, for whatever he undertakes is free from the motive of desire, and his deeds are purified by the fire of wisdom.
यस्य सर्वे समारम्भाः कामसङ्कल्पवर्जिताः।
ज्ञानाग्निदग्धकर्माणं तमाहुः पण्डितं बुधाः॥yasya sarve samārambhāḥ kāmasaṅkalpavarjitāḥ|
jñānāgnidagdhakarmāṇaṃ tamāhuḥ paṇḍitaṃ budhāḥ||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).