Nostalgia is not justified by the beauty of the past. Nostalgia produces beauty as its effect.
Nostalgia is like a grammar lesson in that one finds the present tense but the past perfect.
The Nostalgia assumes its full meaning only when the real is no longer what it used to be.
Nostalgia is an ambivalent longing to erase the temporal difference between subject and object of desire, shot through with not only the impossibility but also the ultimate unwillingness to reinstate what was lost.
Nostalgia is a sadness without an object. It is always ideological because the past it seeks has never existed except as narrative, and hence, continually threatens to reproduce itself as a felt lack.
Nostalgia is capable of transforming experience. It is the great mystery of human life that old grief passes gradually into quiet tender joy.