Philippians 1:6 - Matthew Poole's English Annotations on the Holy Bible

Being confident of this very thing; i.e. having thanked God for what he had done and did for them, he expresseth his firm persuasion and charitable hope of their perseverance for the future. That he which hath begun a good work in you, will perform it; not from any thing in themselves more than others, but because God the Father, (who is not weary of well-doing), having begun the work of faith in them Philippians 2:13, with 1 Thessalonians 6:29, who else were dead in sins, as the Ephesians, Ephesians 2:1, he would preserve and carry on that internal and spiritual work in the fruits of real Christians, and not leave it imperfect, Psalms 138:8 Isaiah 64:8; but would make it perfect, or perfect, stablish, strengthen, and settle them in it, those words being of the same import in Scripture with perform it, connoting the difficulty of it. Until the day of Jesus Christ; i.e. either until the day of their death, when the spirits of just men are made perfect, and Christ appears to their particular judgment, Hebrews 12:23, not as being perfect while here in this state, Philippians 3:12; or rather, until the day of Christ, or latter day, at judgment, 1 Corinthians 1:8 1 Thessalonians 4:15; when they shall be acknowledged to be blameless, to the glory of Christ, who hath carried them through all, and fullfilled the work of faith in them, and glorified them, 2 Thessalonians 1:11, and who are his glory, 2 Corinthians 8:23.