Bhagavad Gita Chapter 6.7
jitātmanaḥ praśāntasya
paramātmā samāhitaḥ
śītoṣṇa-sukha-duḥkheṣu
tathā mānāpamānayoḥ
Translation
For one who has conquered the mind, the Supersoul is already reached, for he has attained tranquillity. To such a man happiness and distress, heat and cold, honor and dishonor are all the same.