In Paul's letter to the Colossians, certain things are said about the all sufficiency of Jesus Christ. These statements tie in well with John's first chapter.
All Things Were Created in Christ
Col. 1:16,17
All things were created by Jesus and for Jesus (see also Jhn 1:1-3). He is before all things and in him all things consist. Some think of Christ as the greatest created being. But He is greater by far than that.
All the Fulness of the Godhead Dwells in Him
Col. 1:19
He is the image, of the invisible God (Col 1:15). He is this not by halves, but in "all the fulness" . Some think of Christ as a hybrid being, half man, half God. But He was "the fulness of God in bodily form" . Jesus was as human as any man. He was as divine as God his Father.
Every Human Being Can Be Made Complete in Christ
Col. 1:27-29
Paul proclaimed Christ to "every man", and his goal was to present every man complete in Christ. The work of Christ is applicable to every man. The work of Christ is not limited and his gospel, "the hope of glory", is for every man. That is why the gospel was preached "in all the world... to every creature under heaven" (Col 1:6,23).
All the Treasures of Wisdom and Knowledge are Hidden in Christ
Col. 2:3
"All wisdom and understanding" (Col 1:9) and "full assurance of understanding in true knowledge" (Col 2:2-3) are available in the gospel of Christ. Christ's word lacks nothing (cf 2Pe 1:3,4).
All Things Are Under the Authority of Christ
Col. 2:10
Jesus...
...is the head of all power and
authority (Col 2:10).
...is the first born over all
creation (Col 1:15,18, 1Co 15:20).
...is the head of the church (Col 1:18).
...has the highest place (preeminence) in all things (Col 1:18).
...is seated at the right hand of God (Col 3:1).
Christ's resurrection and ascension demonstrated His authority over all things.
All Our Sins Are Forgiven Through Christ
Col. 2:13
Paul makes the following points...
In Him we have redemption through His blood. the forgiveness of sins (Col 1:14).
He has made you alive together with Christ, having. forgiven you all trespasses (Col 2:13).
Our sins alienated us from God (Col 1:20-23).
We have our sins forgiven when we are buried with Christ (Col 2:12-13 Rom 6).
We have our sins forgiven as long as we continue in the faith and be not moved away (Col 1:23, see Eph 1:13-14).
Christ Is All In All
Col 3:11
Paul states that Jesus is "all in all". Christians often call this "the all-sufficiency of Christ". We sing a song about Jesus that says, "He is my everything, he is my all". Many doctrines diminish Christ's glory and his sacrifice on the cross. We must be careful never to do that.