The ego or system of the self organises and prioritises the diverse desires and motives that crowd in on you from multiple contexts and in this way staves off chaos, but it does this by fully engaging with desire, serving as its existential support and promoter. The only thing it has to offer, and what enables it to perform this function is its claim to the sense of being. It does not possess being but, as it were, it deputises for being, represents it via a pre-reflective cogito. By generously giving something it doesn't have it gets as close as can be to actually having it. This role play would be empty if it were not so committed to desire.