Unconditional love corresponds to one of the deepest longings, not only of the child, but of every human being; on the other hand, to be loved because of one's merit, because one deserves it, always leaves doubt; maybe I did not please the person whom I want to love me,maybe this, or that—there is always a fear that love could disappear. Furthermore, "deserved" love easily leaves a bitter feeling that one is not loved for oneself, that one is loved only because one pleases, that one is, in the last analysis, not loved at all but used.
Erich Fromm, The Art of Loving
philosophy, psychology