Super spirituality proffers that heaven is not for the good guys but for the good guys who are able to go everyone better. You know those who have 'spiritual disciplines' embedded into their DNA; disciplines like, tithing, fasting, prayer, small group attendance, giving up 'stuff' for whatever, and/or giving oneself to something, etc. etc. etc. The subtle erosion of grace occurs when one thinks that the gasoline of grace gets better mileage when perfect performance is the additive of choice.
Nonsense! Completely unacceptable! There is no way to tie the kingdom of God to anything you or I do! God's Kingdom is here because the King brings it Himself! Not because we give It a helping hand. You or I may do anything stupid or brilliant with the freedom we have in Grace but whatever you or I do, we must never think that it is worth a plugged nickle in the process of our salvation!
Robert Farrar Capon (Between Noon and Three) remembers that Luther wrote that the reformation was a time when people went blind staggering drunk because they discovered, "in the dusty basement of late medivialism, a whole cellarful of 1500 year old, 200 proof grace -- of bottle after bottle of pure distillate of Scripture that would convince anyone that God saves us single-handed."
Century after century humanity tries to pull itself up by its own bootstraps by worrying about the perfection of their performance and then Gospel of Grace bursts on the scene by flatly stating that the saved were home free even before they started!