You have the assurance of God's Word that, if you are his child, he will "equip you in every good thing to do His will, working in us that which is pleasing in His sight, through Jesus Christ" (Hebrews 13:21). Our endurance in faith and joy is finally and decisively in the hands of God. Yes, we must fight. But this very fight is what God "works in us". And he most certainly will do it, for "whom He justified, these He also glorified" (Romans 8:30). He will lose none of those he has brought to faith and justified. "[He] shall also confirm you to the end, blameless in the day of our Lord Jesus Christ. God is faithful, by Whom you were called" (1 Corinthians 1:8-9). Our future is as secure as the faithfulness of God. "Faithful is He Who calls you, and He will bring it to pass" (1 Thessalonians 5:24).- John Piper, Future Grace, p. 318. Emphasis original.