See how one is justified by works and not by faith alone - James 2: 24
Of course because your faith is made EVIDENT by your deeds! - verse 2: 18
but as with Titus 3: 5 or Eph. 2: 9 works DO justify but they do NOT add to anyone's salvation and they are NOT the basis of being saved..... besides belief being the first step it SHOULD be the driving force to overcome... (See 1 Jn 5: 3 - 5 ) overcome NEGLECT, overcome SINFUL DESIRES.......... so if you don't have deeds to back you up, ergo you do NOT believe. Again, see that verse in first John I mentioned....
it is God who works in you. (Philippians 2: 13, see also verse 1: 6 of Philippians) spiritual muscle isn't something you can work out on your own..... while your salvation is something you work out it is something you cannot work for. (Eph. 2: 9 )
But through the Gospel of Jesus Christ we are saved (1 Cor. 15: 1 - 2 )
to do every good work. (Eph. 2: 10, 2 Tim. 3: 17 )