<p>4:16 <i>Therefore we do not give up- </i>As noted on :1 where the same word is used, the power to keep on keeping on comes from the Spirit, and from the firm knowledge that by His grace we shall surely live eternally. The presence of the Spirit in our hearts and lives now is the guarantee that we shall live eternally, and our mortal flesh shall in due course be transformed to Spirit nature. This is why we do not give up, it is why the true Christian faith is no mere passing religion, passion or enthusiasm which comes and goes as we go onwards in life.</p><p><i>But though our outward man is decaying, yet our inward man is renewed day by day</i>- The same word for &quot;inward man&quot; is found in Eph. 3:16: &quot;Be strengthened with power through His Spirit in the inner man&quot;. Rom. 6:4 teaches that after baptism, we live in an ongoing &quot;newness of life&quot;. This is because of the gift of the Spirit, which strengthens and renews the inner man constantly. Just as we are &quot;always&quot; experiencing the Lord's sufferings (:11), so &quot;day by day&quot; we are renewed. A related word is used when Paul teaches that the new creation which begins at baptism makes all things new (2 Cor. 5:17). There is a process on renewal and strengthening ongoing in the hearts or &quot;inward man&quot; of the believer- if we will believe it and permit it. Paul has spoken of this at the end of chapter 3; we are being progressively changed &quot;from glory to glory&quot;, closer and ever more exactly into the mental image of the Lord Jesus. The ongoing nature of the transformation is important to Paul, because it contrasts with the fading glory of the Mosaic system.</p>