Ego is the cause of separation of identifications
By Swami Sivananda
It is the ego which has created the idea of separateness from God or the Atman. It is the ego which is the root cause for all human sufferings and births and deaths.
Ego's identifications
This ego identifies itself with the body, mind, Prana, the senses. Wherever there is ego, there are mineness, selfishness, likes and dislikes, lust, anger, greed, hypocrisy, pride, jealousy, delusion, arrogance, conceit, impertinence, Vasanas (subtle desires), Trishna (cravings) and Vrittis or Sankalpa, clinging to this earth-life (Abhinivesha), agency, doer (Kartha) and enjoyer (Bhokta).