Bhagavad Gita · Chapter 12: The Path of Devotion

Bhagavad Gita 12.18

samaḥ śatrau ca mitre ca tathā mānāpamānayoḥ | śītoṣṇasukhaduḥkheṣu samaḥ saṅgavivarjitaḥ ||

One who is the same toward enemy and friend, in honour and dishonour, in cold and heat, in pleasure and pain, and who is free from attachment;

Modern context

The same toward enemy and friend. This is perhaps the hardest line in the chapter. It does not mean treating enemies as friends, or pretending there is no difference. It means not letting the difference disturb one's inner balance or one's basic goodwill. The devotee can oppose someone and still not hate them, can be close to someone and still not cling.