Salvation is not a singular event, but is a work of God, a process if you will, whereby God conforms us completely into the image of His Son. This work starts with justification, continues on in sanctification, and ends in glorification.
Romans 8:29-30 For those whom he foreknew, He also predestined to be conformed to the image of His Son, so that He would be the first born among many brethren; and these whom He predestined, He also called; and these whom He called He also justified; and these whom He justified, He also glorified.
Philippians 1:6 For I am confident of this very thing, that He who began a good work in you will perfect it until the day of Christ Jesus.
Philippians 2:12-13 So then, my beloved, just as you have always obeyed, not as in my presence only, but now much more in my absence, work out your salvation with fear and trembling; for it is God who is at work in you, both to will and to do for His good pleasure.
Ephesians 2:10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them.
I John 3:2 Beloved, now we are children of God, and it has not appeared as yet what we will be. We know that when He appears we will be like Him, because we will see Him just as He is.
Salvation is the work of God that carries out the purpose of God, which results in the glory of God.