According to James, the prayer of a righteous man has great power in its effects. James encourages his readers to pray in all circumstances, both in times of trouble and in times of joy. He also stresses the importance of living a righteous life, as this can have a positive impact on the effectiveness of our prayers. When we pray with a sincere and righteous heart, our prayers can have a powerful impact on the world around us. Although James does not specify exactly what these effects may be, he emphasizes that the prayers of the righteous are not in vain and that they can make a real difference in the world. Therefore, the central message of James' teaching is that prayer is a powerful tool that can be used to bring about positive change in our lives and in the world, especially when accompanied by a righteous life.