Bhagavad Gita 2.14

मात्रास्पर्शास्तु कौन्तेय शीतोष्णसुखदु:खदा: ।
आगमापायिनोऽनित्यास्तांस्तितिक्षस्व भारत  ॥

mātrā-sparśās-tu kaunteya śītoṣṇa-sukha-du:kha-dā:
āgamāpāyino’nityās-tāṃs-titikṣasva bhārata – 2.14

Contacts between the senses and their objects, O son of Kunti, produce sukha-du:khas (joy and sorrow), like cold and heat. O Bharata, they come and go, hence are transitory. You must forbear them.