Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 44
Sanskrit:
आशा हि परमं दु:खं नैराश्यं परमं सुखम् ।यथा सञ्छिद्य कान्ताशां सुखं सुष्वाप पिङ्गला ॥ ४४ ॥
ITRANS:
āśā hi paramaṁ duḥkhaṁnairāśyaṁ paramaṁ sukhamyathā sañchidya kāntāśāṁsukhaṁ suṣvāpa piṅgalā
Translation:
Material desire is undoubtedly the cause of the greatest unhappiness, and freedom from such desire is the cause of the greatest happiness. Therefore, completely cutting off her desire to enjoy so-called lovers, Piṅgalā very happily went to sleep.