Treating pleasure and pain as equal, gain and loss as equ...

सुखदुःखे समे कृत्वा लाभालाभौ जयाजयौ। ततो युद्धाय युज्यस्व नैवं पापमवाप्स्यसि॥ Treating pleasure and pain as equal, gain and loss as equal, victory and defeat as equal — engage in battle. Fighting with this equanimity, you will not incur sin. — Bhagavad Gita 2.38