Only the interactions of the senses and sense objects give cold,heat,pleasure and pain. These are temporary, appearing and disappearing; therefore learn to tolerate without being disturbed (2.14)

Bhagavad Gita, Chapter 2

Even the mind of the wise man who labours for perfection is carried away by the vehement insistence of the senses, O son of Kunti. (2:60)

Bhagavad Gita, Chapter 2

For certain is death for the bornAnd certain is birth for the dead;Therefore over the inevitableThou shouldst not grieve.

Bhagavad Gita, Chapter 2

On action alone be thy interest,Never on its fruits.Let not the fruits of action be thy motive,Nor be thy attachment to inaction.

Bhagavad Gita, Chapter 2