This may seem a strarnge questsion after all we cant enter Heaven by our works of righteousness,yet do we act as if we have this in Heaven in Christ at Gods side allready done and we sit with Him in Heavenly places(as Bible says) in Christ safe .Hiding in Thee!!Safe in The Rock of ages. If so why do we doubt our salvation as if somthing still needs to be done? to Christs finnished work? We have His perfection imputed or we dont! He died for our sins or He did not.As soon as we rest on our works in any way for Salvation we have fallen from Grace says Paul in Gal. " Indeed this is one of the greatest mysteries in the world-namely ,that a righteousness that resides with a person in heaven should justify me, a sinner on earth." John Bunyan This is no excuse to sin ,indeed if we think so we not saved.