Self righteousness is the big lie of Satan. The truth is you are saved by Christ; the lie is you are saved by anything other than Christ. That certain rules, doing specific routines, belonging to a particular system, being good enough to outweigh your shortcomings--there’s a myriad of possible systems to counter the one truth, and they are all part of Satan’s big lie. If Satan can get someone into a system that says they are righteous, it’s very hard to extract the from it. One reason is that the self-righteous are very proud. ~John MacArthur, Truth Endures, The Simple Gospel