Pain and pleasure are two opposites that we experience in daily life,
but they are relative terms. When one sees the horizon through the
window, it appears very limited, but when one goes to the roof, he
finds a vast horizon around him.
In the same way, when one learns to expand his vision, the meaning of
pain and pleasure also changes. Pain and pleasure are two concepts
created by our mind and senses when they contact the objects of the
world. But when the sense of discrimination is applied, they vanish
because one's values change.
Pain and pleasure change their values when one attains a higher
dimension of life. One feels pain and pleasure according to his inner
strength, endurance, tolerance, and purpose in life. One's experience
of pain and pleasure is dependent on what is important to him. For
example, a mother experiences pain when she gives birth to a baby,
but she goes through that pain because she wants to accomplish
something higher....
In the modern world people become confused about what is right, and
they are uncertain about which duties should be given the highest
priority. The important is always important; therefore it should be
attended to first even though it may seem to be painful. In
performing one's duty one should learn to go beyond his
identification with pleasure and pain, loss and gain, and all the
pairs of opposites.
Swami Rama
Perennial Psychology of the Bhagavad Gita