The ignorant one, mistakenly identifying with the body, erroneously thinks, 'I am the doer'.

The ignorant one, mistakenly identifying with the body, erroneously thinks, 'I am the doer'. This is the mark of egoism. In truth, Arjuna, all actions are really performed by worldly nature, not by Atma. The Self (Atma), remember, is beyond all action, all karma.

Krishna to Arjuna in the Bhagavad Gita, A Walkthrough for Westerners.