Ramana Maharshi: You can never find the mind through mind. Pass beyond it in order to find it non-existent.

Questioner: Then one must directly go to seek the ego. Is it so?

Ramana Maharshi: That's it. Mind, ego, intellect are all different names for one single inner organ (antahkarana). The mind is only the aggregate of thoughts. Thoughts cannot exist but for the ego. So all thoughts are pervaded by ego (aham). Seek wherefrom the `I' rises and the other thoughts will disappear.

~ from 'Talk 473'; 15th March, 1938