38. The sense of doership reaps the fruits of action (karma): karma ends when the doer realizes his true nature. - Ramana Maharshi

Surrender is giving oneself up to the original cause of one's being. Do not delude yourself by imagining this source to be some God outside you. One's source is within oneself. Give yourself up to it. That means that you should seek the source and merge in it. Because you imagine yourself to be out of it, you raise the question, 'Where is the source'?

Non-action is unceasing activity. The sage is characterized by eternal and intense activity. His stillness is like the apparent stillness of a fast rotating gyroscope.

2. That, from where all the activities of the embodied beings emerge, is mentioned as the heart. The description of its form is conceptual.