According to Peter , a Christian should exercise his freedom by

The apostle Peter encourages Christians to exercise their freedom by doing what is right. In his letter to the early Christians, Peter emphasizes that Christians should not use their freedom as a pretext for evil or as an excuse to indulge in sinful behavior. Instead, he advises them to use their freedom responsibly and to live in a way that pleases God. This means being obedient to God's commandments and treating others with love, respect, and kindness. In essence, Peter is saying that freedom comes with responsibility and that Christians should use their freedom to do good and bring glory to God.