What does the Bible say about effectual prayer?

In the Scriptures, particularly in James 5:16, it is stated that the effectual, fervent prayer of a righteous man avails much. This highlights the importance of approaching God in prayer with righteousness—that is, through faith in Jesus Christ, the only Righteous One. Our prayers are made effective, not by our own merit, but through the intercession of Christ and His perfect obedience to the Father. As believers, we are encouraged to seek the Lord with confidence, assured that He hears us because of our union with Christ and His continuous intercession for us (Hebrews 7:25).