In Christ alone

Colossians 2:8-15
Be careful about hollow and deceptive philosophy, which depends on human tradition and the basic principles of this world rather than on Christ.
For in Christ all the fullness of the Deity lives in bodily form and you have been given fullness in Christ.
In Him you were also circumcised, in the putting off of the sinful nature, circumcision done by Christ, having been buried with him in baptism and raised with him through your faith in the power of God, who raised him from the dead.
Triumphing over them by the cross.
Tradition in Jewish are 1) to practise circumcision, 2) to observe the Jewish regulations about food and drink 3) to keep the laws about regular worship, no only at major festivals but also on the sabbath.
Why?
Christian usually be criticised by the principles of this world, we are easy be attracted by the hollow philosophy and bound by the human tradition.
In Christ we are given fullness in spiritual and bodily form.
Heart circumcision is more important for the behavior will change to follow Jesus.
It was misleading and dangerous because it was based on human teaching and not on Christ.
Christ is the One who embodies 'all the fullness' of God and in him Christan find their own fulfilment.
How?
In Christ alone I am his, and he is mine! Am I put off all my sinful nature?