being confident of this very thing, that he who began a good work in you will perfect it until the day of Jesus Christ:

being confident of this, that He who began a good work in you will carry it on to completion until the day of Christ Jesus.

having been confident of this very thing, that He who did begin in you a good work, will perform it till a day of Jesus Christ,

having confidence of this very thing, that he who has begun in you a good work will complete it unto Jesus Christ's day: