Bhagavad Gita 6.32

आत्मौपम्येन सर्वत्र समं पश्यति योऽर्जुन।सुखं वा यदि वा दुःखं सः योगी परमो मतः ॥६.३२॥

ātmaupamyena sarvatra samaṃ paśyati yo’rjunasukhaṃ vā yadi vā duḥkhaṃ saḥ yogī paramo mataḥ

He who, through the likeness of the Self, O Arjuna, sees reality everywhere, be it pleasure or pain, is regarded as the highest Yogi.

गीता