“Simon, Simon, behold, Satan demanded to have you, that he might sift you like wheat, but I have prayed for you that your faith may not fail. And when you have turned again, strengthen your brothers.” (Luke 22:31–32)

Though Peter, in fact, failed miserably, by denying Jesus three times, the prayer of Jesus preserved him from utter ruin. He was brought to bitter weeping and restored to the joy and boldness that showed itself in Peter’s message at Pentecost. Jesus is interceding for us today in the same way that our faith might not fail. Paul says this in Romans 8:34.

Jesus promised that his sheep would be preserved and never perish. “My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand” (John 10:27–28).

The reason for this is that God works to preserve the faith of the sheep. “He who began a good work in you will bring it to completion at the day of Jesus Christ” (Philippians 1:6).

We are not left to ourselves to fight the fight of faith. “It is God who works in you, both to will and to work for his good pleasure” (Philippians 2:13).

You have the assurance of God’s word that, if you are his child, he will “equip you with everything good that you may 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, as it says in Romans 8:30, “Those whom he justified he also glorified.” The glorification of God’s justified children is as good as done.

He will lose none of those he has brought to faith and justified.