“Being confident of this, that He who began a good work in you will perform it until the Day of Christ Jesus.” In this verse the Apostle Paul is referring to the Power of the Holy Spirit in us who believe. This is so important, because the more I study the life of Christ, the more I realise the influence and the Power of the Holy Spirit working in Him, in His life and ministry. Just as the disciples had to wait in Jerusalem until the Holy Spirit came, before they could begin their ministry, so Jesus Himself did not begin His powerful public ministry until after He had received the Holy Spirit! Matt 3.16-17; Mk 1.9-12; Luke 3.21. That same Holy Spirit who was in Christ should be in us! And the Holy Spirit who has begun working in us, will continue until the Day Christ returns! (Bible Study of Philippians)