There have been five great kisses since 1642 B. C. . . (before then couples hooked thumbs. ) And the precise rating of kisses is a terribly difficult thing, often leading to great controversy. . . . Well, this one left them all behind.
You can know everything that the books have to say, but ultimately it boils down to whether we do the inner work of devotion and surrender, whether we can put aside our own agendas and allow the spirit to move through us.