"What is threatened and at the centre of the pain of mourning is the loss of cohesion and harmony between the ego and the internal parents. Instead chaos prevails in the internal world.
The loved objects are not annihilated or got rid of but the internal relation with them is in peril. Mania and triumph are the means of gaining mastery over the vengeful and damaged internal parents.
When mania abates, pining and sorrow for the loved internal objects come back and allow for the reestablishment of a cohesive and harmonious world of internal objects."
The New Dictionary of Kleinian Thought