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.
Life is the Lord's finishing school, as He uses all of what we encounter to continually conform us into the image of Christ until we are complete in Him. He leaves nothing unused as He works all things together for our good, and our good is to become more like Christ. He has begun the work of salvation in us and will continue in that work until it is perfectly accomplished. So, my fellow saints, rejoice this day that He is busy at work in you. Rejoice that He will not leave undone the good work that He has started, and will continue to work in you to accomplish His good pleasure for His glory, and your complete salvation.
Now may the God of peace Himself sanctify
you entirely; and may your spirit and soul and
body be preserved complete, without blame
at the coming of our Lord Jesus Christ.
Faithful is He who calls you, and He will also
bring it to pass.
I Thessalonians 5:23-24