Bhagavad Gita Chapter 2, Verse 14

मात्रास्पर्शास्तु कौन्तेय शीतोष्णसुखदुःखदाः | आगमापायिनोऽनित्यास्तांस्तितिक्षस्व भारत ||

mātrā-sparśās tu kaunteya śītoṣṇa-sukha-duḥkha-dāḥ āgamāpāyino 'nityās tāṁs titikṣasva bhārata

O son of Kunti, the contact of the senses with their objects gives rise to cold and heat, pleasure and pain. These come and go and are temporary. Endure them, O Bharata.

Arjuna is paralyzed by grief, so Krishna teaches: all sensory experiences—pleasure and pain, hot and cold—are temporary ('anityāḥ') and arise from sense contact ('mātrā-sparśāḥ'). The command is 'titikṣasva'—endure them. This isn't suppression; it's understanding. These experiences come and go like weather. You don't need to chase pleasure or flee pain—both are temporary visitors. The insight: your wellbeing depends on seeing through their impermanent nature, not on arranging circumstances.