By recognizing the wholeness of other objects - the infant comes to realize and to experience his own wholeness. The ego re-integrates. But the transition from the paranoid-schizoid position to the depressive one is by no means smooth and assured. Excess anxiety and envy can delay it or prevent it altogether. Envy seeks to destroy all good objects, so that others don't have them.
Envy destroys the good object but leaves the persecutory , bad object intact.
The more whole the object, the greater the envy. Thus, envy feeds on its own outcomes. The more envy, the less integrated the ego is, the weaker and inadequate it is - the more reason for envying the good object and other people. Envy is the hallmark of narcissism and the prime source of what is known as narcissistic rage. They will fail an exam to frustrate a teacher they adore and envy.