15 He is the image of the invisible God, the firstborn of all creation.
Sin blinded the eyes of mankind so that no man could see God. The very image of God was marred and broken by the fall of man. In the beginning, God created mankind in the image of God and commissioned man and woman to spread His image and glory across the world (Genesis 1:26-28). Yet, Adam sinned and as a result, the image of God was shattered (C.f. Romans 5). As history has progressed, God’s image has become more and more depraved through the work and sin of man. Indeed, so great is the fall of man, that man no longer resembles the image of God.
The loss of this image is the loss of communion with God. God’s creation has been severed from Him by sin: the willful rejection of God by the beings that are supposed to reflect Him. God began His work with the intention of spreading His own image across the earth. His mission has not changed. Christ comes as the image of God. He is the perfect reflection of the glory and character of God. Being God, Himself, Christ is God. Thus, when you have seen Christ, you have seen the Father (John 14:9). That severed communion is re-created and restored in Jesus Christ. In knowing Jesus, we can know God.
The image of God is the son of God. He is the heir to all that God has. Jesus, being one with God, is also distinct as the second person of the Trinity. He is the Son. He is the image of God and bears the same essence as God, yet remains uniquely individual. His position in the Trinity is best understood in human terms as, Son. In this way, we can understand that He inherits all the wealth of God. This is what is meant by “firstborn.” This is not to say that Jesus was a created being. He was not created. He has been God from the beginning (c.f. John 1:1-5). He was not created but born. The terminology of birth here is specifically addressing priority. Jesus is firstborn of creation in the sense that He is the first in priority.
Jesus is the image of God, and the firstborn. Consider for a moment the implications of such truth. In Jesus, men can see what is invisible. The invisible God of all creation is made visible in Jesus Christ. Further, He is the One on whom priority in all things rest. He is the first to be worthy. He is the first to be recognized. He is the first to be worshiped. He is the first to receive glory. He is the first to be honored. He is the first to speak. He is the first to whom one should listen. He is the first in authority. He is first in position. He is first in majesty. He is first in mankind’s affections. He is the first to work. He is the first! He is first. There are too many things and people to which western Christianity ascribes priority. Too many things take the place of first priority over following and knowing Jesus. Yet, Jesus remains first. If anything else stands in front of Him, then truth is lost.
Jesus is not granted the priority based on man’s acceptance of that order. Rather, Jesus is given priority because that priority is the truth. Jesus being firstborn does not depend on man’s opinion of His position or authority. He simply is firstborn. He is the Son of God. This is truth and it needs no validation from humanity. All the earth could reject Jesus Christ and still, He remains: the image of God, firstborn.
 For a fuller examination of this I recommend John MacArthur’s commentary on Colossians.