The Bhagavad Gita — Lord Krishna talking to Arjuna, Chapter 2, stanzas 14 & 15

When the senses contact sense objects, a
person experiences cold or heat, pleasure or
pain. These experiences are fleeting; they
come and go. Bear them patiently, Arjuna.

Those who are not affected by these changes,
who are the same in pleasure and pain, are
truly wise and fit for immortality. Assert your
strength and realize this!

From The Bhagavad Gita, translated by Eknath Easwaran, founder of the Blue Mountain Center of Meditation, copyright 1985; reprinted by permission of Nilgiri Press, P. O. Box 256, Tomales, Ca 94971, www.nilgiri.org.