How do we know Jesus' prayers are effective for us?

The effectiveness of Jesus' prayers is rooted in His role as our great high priest and mediator. In John 17, Jesus explicitly prays for His followers, ensuring their protection and unity. This intercessory prayer emphasizes that He is actively involved in safeguarding our spiritual well-being. Martin Lloyd-Jones emphasizes that Christ gives us back to the Father, asking the Father to keep us. The assurance we find in Jesus' prayers lies in the understanding that His righteousness and mediatorial work are applied to us, ensuring that our salvation is secure and God’s purposes for us are assured.