The feeling of a separate “I”, which we call ego-consciousness, is directly related to the strength of ignorance, greed, and hatred. The deepest meaning of ignorance is the believing in, identifying with and clinging to the ego, which as we have seen, is nothing but an illusive mental phenomenon. But because of this strong clinging to ego-consciousness, attachment/desire, anger/hatred arise and repeatedly gain strength.

The ego needs activity in order to exist. Like and dislike, attachment, aversion, greed and hatred are the main overt activities of the ego. The more desire and aversion we have the more alive we feel, the more real and concrete the ego seems. In reality, the ego depends on desire, its life-blood is desire. The ego and desire are like the two sides of a coin — one cannot exist without the other. The ego is projected desire, and desire is projected ego. It is like pedalling a bicycle: if we go on pedalling, the bicycle goes on moving; but if we stop pedalling the bicycle will start slowing down and eventually collapse. The more we go on generating desire the ego seems very real. When desiring stops the ego then appears as an illusion.
Source: www.maithri.com