Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 47

Sanskrit:

परं सौख्यं हि नैराश्यं स्वैरिण्यप्याहपिङ्गला ।तज्जानतीनां न: कृष्णे तथाप्याशा दुरत्यया ॥ ४७ ॥

ITRANS:

paraṁ saukhyaṁ hi nairāśyaṁsvairiṇy apy āha piṅgalātaj jānatīnāṁ naḥ kṛṣṇetathāpy āśā duratyayā

Translation:

Indeed, the greatest happiness is to renounce all desires, as even the prostitute Piṅgalā has declared. Yet even though we know this, we cannot give up our hopes of attaining Kṛṣṇa.

Purport:

The story of Piṅgalā is narrated in the Eleventh Canto, Eighth Chapter, of Śrīmad-Bhāgavatam.