Here's scripture...for it is God which worketh in you both to will and do of His good pleasure...Philippians 2:13.
God is at work in every Christian.
The Bible actually teaches that it is possible for one who is eternally saved by God’s grace to:
1) Commit idolatry and apostasy (1 Kgs. 11:1-10)
2) Believe only for a while (Luke 8:13)
3) Not continue in the Word of Christ (Jn. 8:31)
4) Not abide in Christ (John 15:1-8)
5) Become disqualified in the race of the Christian life (1 Cor. 9:24-27)
6) Resist God’s chastening and correcting to the point of physical death (1 Cor. 11:30-32)
7) Stray from the faith (1 Timothy 1:5-6)
8) Shipwreck faith (1 Timothy 1:18-20)
9) Fall away from the faith (1 Timothy 4:1-3)
10) Deny the faith (1 Timothy 5:8)
11) Cast off initial faith and follow Satan (1 Timothy 5:12-15)
12) Stray from the faith by loving money (1 Timothy 6:9-10)
13) Stray from the faith by professing false doctrine (1 Timothy 6:20-21)
14) Deny Christ and be faithless (2 Timothy 2:11-13)
15) Have faith overthrown (2 Timothy 2:14-18)