Jesus has finished the work, it is already done, so, "I can't mess it up". My sins have already been punished and atoned for, so, "I can't mess it up". I am in Christ accepted and complete, and sealed unto the day of redemption; in Christ now and in Christ forever so, "I can't mess it up." I feel like I have messed up everything else but, thanks be unto God I can't mess this up. It is un-messed-up-able.