What does the Bible say about being complete in Christ?

In Colossians 2:8-9, it is stated that 'for in him dwelleth all the fullness of the Godhead bodily, and ye are complete in him.' This completeness signifies that we lack nothing in regard to our salvation; it is entirely fulfilled in Jesus. The concept of being complete in Christ centers on the idea that Jesus’ sacrifice was perfect and sufficient, as proclaimed in John 19:30 when Jesus said, 'It is finished.' This fulfillment means that our standing before God is not based on our own works but on the finished work of Christ, leaving no room for additions or alterations in our salvation.