Being confident of this very thing, that he which has begun a good work in you will perform it until the day of Jesus Christ:
Man is not formed in his infancy, but passes through several stages which bring him gradually to perfection; one polishes his memory, another sharpens his mind; this strengthens his judgment, and that embellishes his manners; so is it with the work of piety. For this new man who must be brought to perfection, can only be so by various degrees. He has his infancy before he attains his riper years. As in the schools of painters they first draw the figures with the pencil, and then add the colouring, giving them at different sittings and with much labour the last gloss of perfection, which in the studies of those which they adorn steals the senses of the beholders; so in the school of God, the faithful are begun and the work sketched, and then they are polished and finished. Here this work is well begun; but it can only be finished in heaven. We are the pencil sketch of the work of God to which He daily adds some touch; but the last finishing stroke we shall not receive till the great day of the Lord.
Parallel VersesKJV: Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ: