The big question is whether or not we incorporate the word "lust" to be the same as the word "Desire" if we do then we are taught that the desire for the things of the Spirit and spiritual aspects of things is not bad, but is a good thing, words concepts like faith, joy happiness, hope, love, joy, kindness, compassion, knowing and practicing righteousness and seeking out justice and most of all real, true love...
All the the while seeking out to be and do these things with a meek, mild, humble, showing humility, kind, generous heart, soul, mind and spirit, and in a mate, seeking out the these things of the spirit of/in a person and desiring that in them, and being attracted to or drawn to these things in them, the desire for companionship, friendship and someone to share your life with and seek out and concentrate on seeking out (desiring) all the good things of the spirit together, in this case it is considered "desire" and not "lust"....
Desires of the spirit and looking at someone, so as to desire them from a spiritual point-of-view is not wrong or condemned, however having fleshly eyes and seeking longing to fulfill the desires of the flesh alone, is lust and is condemned and explained as to what these are in many, many different places throughout the Bible...
That's my opinion anyways, God Bless!