The preaching of Christ and Him crucified is the preaching of the power of God, and therefore it is the preaching of the Gospel, for the Gospel is the power of God. ... The conclusion therefore is that the Gospel is the revelation of Jesus Christ in men.
So we are fully assured that the Gospel is the making known of Christ in men. Or rather, the Gospel is Christ in men, and the preaching of it is the making known to men of the possibility of Christ’s dwelling in them.
Instead of attacking their error and combating it with hard argument, the apostle begins with an experience, which illustrates the case in hand. In this narrative he shows that salvation is wholly by faith for all men alike, and not in any degree by works. As Christ tasted death for every man, so every man who is saved must have Christ's personal experience of death and resurrection and life. Christ in the flesh does what the law cannot do. Galatians 2:21; Romans 8:3,4
We are reconciled to God by the death of Christ, and saved by His life. The life, which does this, is the life from which all created things came, and by which they exist. The power of redemption is the power of creation, and that is the power of the life of Christ. The Sabbath is a great memorial of the wonderful works of God, which are the measure of His graciousness. He gave it that we might know that He is the Lord that sanctifies us.