Being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ; Philippians 1:6 NKJV
Having confidence in another person’s salvation is a hard thing. We spend much of our times as parents trying to discern the spiritual condition of our kids. They begin as toddlers believing the things they are told about the Lord simply because they trust their parents. These toddlers grow into teenagers and begin to think and process information on their own. Maybe they had professed Christianity in the early stages of their teenage years, and now aren’t sure they want to follow Jesus any longer. Maybe they don’t necessarily want to renounce Christianity because of their fear of hell; so they go along their way professing Christ from their mouth, but reflect him not in their lives. Whatever the case, it is hard to have confidence in another person’s salvation.
Who we need to have confidence in during those trying parental years is God! Paul was confident in this very thing that He who began the good work of salvation, would be the one who will complete it until the day of Jesus Christ. Our confidence cannot come from the shifting thoughts and emotions of another person, but on the immutability of our God who does not, and cannot change. He completes what He starts!
Every good gift and every perfect gift is from above, and comes down from the Father of lights, with whom there is no variation or shadow of turning. James 1:17 NKJV