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In page Melanie Klein:

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According to Klein, envy threatens the capacity to establish a relationship with the good object. Excessive envy can prevent the infant from forming a positive relationship with the breast and internalizing it as a good internal object. This undermines the process of establishing a good internal object, which is vital for healthy ego development.[1] Klein also distinguishes between envy and greed: "Excessive greed aims at complete scooping out, sucking dry, and devouring the breast; whereas envy aims at poisoning and destroying the good breast so that it cannot be enjoyed."[2] This distinction is important for understanding the difficulties in moving from the paranoid-schizoid position to the depressive position.[citation needed]