For the lover, love is a source of reasons. It is "notoriously difficult to illuminate," but, according to Harry Frankfurt, should not be confused with infatuation or desire, obsession or dependence, that is, with what a person believes or feels. Love, as the general thesis of the book states, is rather a matter of will, more precisely: the practical concern for what is good for the one you love. Frankfurt's insightful book concludes with a surprising reflection on self-love, which he describes as the purest form of love.