Bhagavad Gita 5.20

न प्रहृष्येत्प्रियं प्राप्य नोद्विजेत्प्राप्य चाप्रियम्।स्थिरबुद्धिरसम्मूढो ब्रह्मविद्ब्रह्मणि स्थितः॥

na prahṛṣyetpriyaṃ prāpya nodvijetprāpya cāpriyam |sthirabuddhirasammūḍho brahmavidbrahmaṇi sthitaḥ ||

Resting in Brahman, with a steady intellect and undeluded, the knower of Brahman neither rejoices upon obtaining what is pleasant nor grieves upon obtaining what is unpleasant.

He who knows and lives in the Absolute remains unmoved and unperturbed; he is not elated by pleasure nor depressed by pain.

Our plain-language meaning of this verse is waiting for scholar review.