I suspect you have not read Desiring God, Piper’s seminal book, maybe because you unjustifiably recoil at the subtitle? It fits very nicely with a pair of parables, however:
God is desirable, and not only that, he’s the ultimate desire. If we are not seeking the gratification of having him in our lives, that makes obedience to the greatest commandment rather difficult. He is not just a set of ideas to subscribe to.