You are a minister of the New Covenant. You are to minister life by the power of the Spirit. You are to offer the hope of faith-righteousness through Christ. Being a minister of the New Covenant doesn’t mean you only read or minister out of the New Testament books of the Bible, it means you minister to others out of the promises inherited through the finished work of Jesus.
The work of Jesus in His sinless life, as well as His death, burial, and resurrection, are the sureties of the eternal covenant we have with God in Christ. Ministering to others out of the authority and victory of Christ can only be done by the Spirit of God who dwells in us.