It is sometimes felt as a longing for a far off country, but not a particular earthly land which we can identify. Furthermore there is something in the experience which suggests this far off country is very familiar and indicative of what we might otherwise call "home". In this sense it is a type ofnostalgia, in the original sense of that word. At other times it may seem as a longing for a someone or even a something. But the majority of people who experience it are not conscious of what or who the longed for object may be. Indeed, the longing is of such profundity and intensity that the subject may immediately be only aware of the emotion itself and not cognizant that there is a something longed for.

The key ingredient of the experience, as Lewis treats it, is that this longing—never fulfilled—is itself sweeter than the fulfillment of any other human desire. Another feature is that it is so deeply personal that it does not occur to the one feeling it that others would have similar experiences and so is rarely communicated verbally. For most people it is something which cannot be put into words. Indeed the present description of Sehnsucht is itself inadequate and is only suggestive of it. Yet, though difficult to define, Lewis maintained that this is a universal experience.