But take up the weapons. Compare note on Romans 13:12. We make ourselves part of Christ in baptism (Galatians 3:27). Here the thought is that we ourselves are to take the weapons (principles?) of Christ and make them part of our fighting-gear. The new birth (John 3:5) is only the beginning of our new life in Christ, and we learn and apply the teaching of Christ to the totality of all we do. This means we can no longer be a slave to our sinful nature.

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Old Testament