Bhagavad Gita Quote 1

14.
The contacts of the senses with the objects, Oh son of Kunti, which cause heat and cold and pleasure and pain, have a beginning and an end; they are impermanent; endure them bravely, Oh Arjuna!

15.
That firm man whom surely these afflict not, Oh chief among men, to whom pleasure and pain are the same, is fit for attaining immortality!