Bhagavad Gita 6.32

आत्मौपम्येन सर्वत्र समं पश्यति योऽर्जुन |
सुखं वा यदि वा दु:खं स योगी परमो मत:

Translation

I regard them to be perfect yogis who see the true equality of all living beings and respond to the joys and sorrows of others as if they were their own.