Strength for believers and Victory over sin!

We know that anyone born of God does not continue to sin; the one who was born of God keeps him safe, and the evil one cannot harm him. We know that we are children of God, and that the whole world is under the control of the evil one. We know also that the Son of God has come and has given us understanding, so that we may know him who is true. And we are in him who is true–even in his Son Jesus Christ. He is the true God and eternal life.
(1 John 5:18-20 NIV)

 
He gives strength to the weary,
And to him who lacks might He increases power.

Though youths grow weary and tired,
And vigorous young men stumble badly,
Yet those who wait for the LORD
Will gain new strength;

They will mount up with wings like eagles,
They will run and not get tired,
They will walk and not become weary.
(Isaiah 40:29-31 NASB)