Bhagavad Gita,Chapter 2, Shloka 14-15

O son of Kunti, the contacts between the senses and their objects, which give rise to the feelings of heat and cold, pleasure and pain etc., are transitory and fleeting; therefore, Arjuna, endure them.Arjuna, the wise man to whom pain and pleasure are alike, and who is not tormented by these contacts, becomes eligible for immortality. (14-15)