Let us now apply to melancholia what we have learnt about mourning. In one set of cases it is evident that melancholia too may be the reaction to the loss of a loved object. Where the exciting causes are different one can recognize that there is a loss of a more ideal kind. The object has not perhaps actually died, but has been lost as an object of love (e.g. in the case of a betrothed girl who has been jilted). In yet other cases one feels justified in maintaining the belief that a loss of this kind has occurred, but one cannot see clearly what it is that has been lost, and it is all the more reasonable to suppose that the patient cannot consciously perceive what he has lost either. This, indeed, might be so even if the patient is aware of the loss which has given rise to his melancholia, but only in the sense that he knows whom he has lost but not what he has lost in him."
- Sigmund Freud