José Ortega Y Gasset said this quote
“ Next time we will look at this from a much more basic point of view and one antedating all zoology, which, glimpsed only a little after my twentieth year, made write in those days that what is most valuable in man is his eternal and almost divine discontent, a discontent which is a kind of love without a beloved, and like an ache which we feel in members of our body that we do not have. Man is the only being that misses he has never had. And the whole of what we miss, without ever having had it, is never what we call happiness. From this one could start a meditation on happiness, an analysis of that strange condition which makes man the only being who is unhappy for the very reason that he needs to be happy. That is, because he needs to be what he is not. ”