How do we know that prayer is powerful?

The power of prayer is rooted in the believer's righteousness, which is a gift from God through Christ. James highlights the effectiveness of prayer offered by those who are in Christ, stating that such prayers bring about significant outcomes. Believers are assured that their prayers are heard and answered according to God's will and purpose. This assurance is not based on the believer’s merit, but rather on the redemptive work of Christ, which grants them access to the Father. In trials and afflictions, a believer's prayer becomes a means of grace and strength, reinforcing the idea that God is actively involved in the lives of His people through prayer.