The Apostle Paul also mentions the other of our two “immeasurable journeys” in Philippians 1:25:
Philippians 1:25 Convinced of this, I know that I will remain and continue with you all, for your progress and joy in the faith.
The issue here is Paul’s ongoing concern for the individual Philippian Christians after they have trusted Christ and been baptized. He is immensely concerned about their “progress and joy in the faith.” Another name for “progress in the faith” is sanctification, the internal journey of gradual growth into Christlikeness. This internal journey is as important to Paul as the external, and that is why he wrote Philippians to begin with. His desire is that his letter will help them make “progress in the faith,” and to this end he constantly preaches, teaches, prays, and labors. He is greatly concerned that they become fully mature in Christ, “letting the manner of their life be worthy of the gospel of Christ” (1:27), responding to persecution with his same joyful attitude (1:28), putting others’ needs ahead of their own with the perfect servant heart of Christ (2:1-11), “working out their salvation with fear and trembling” (2:12-13) as Paul did, by focusing totally on Christ, “pressing on toward the goal for the upward call of God in Christ Jesus,” (3:7-14) learning to rejoice, and trust, and think, and be content constantly in Christ (4:4-13).
This internal journey is the personal struggle of each Christian with the world, the flesh and the devil. It requires a different kind of valor in the face of suffering than does the external journey, but it is the essence of the ongoing saving work of Christ in the individual Christian.
In the final analysis, these two journeys are really one and the same thing, and they are carried on for the same ultimate goal—the glory of God in the final perfection of the church. God has ordained that His chosen ones shall most certainly be saved to the uttermost, they shall be resurrected from being “dead in transgressions and sins” (Ephesians 2:1) and brought to absolute perfection in Christ. Christ came to “save His people from their sins” (Matthew 1:21), and that means to save His chosen ones from everything that sin has done to them. The measure of salvation is total conformity to Christ (Romans 8:29), and He will not stop until each of the elect are brought into this perfection. Thus do the two immeasurable journeys become one: only when each individual elect of God is 1) brought to personal faith in Christ through the missionary work of the Church, and 2) totally glorified in Christ, perfect in body, soul, and spirit in the Kingdom, will the work of God in this world be complete. These two journeys have one goal: “the praise of His glory” (Ephesians 1:12, 14).