Ego is the fear of losing openness, the fear of losing the egoless state. This is the meaning of self-deception, in this case — ego crying that it has lost the egoless state, its dream of attainment.
Trungpa identifies self-deception not as a moral category but as the very structure of ego — the self-maintaining fiction that perpetuates itself through fear, hope, and the illusion of attainment.
, Cutting Through Spiritual Materialism, 1973thesis