It is necessary to seek Christ for mercy because He is the sole source of God's grace and forgiveness for sinners.
As stated in the sermon, seeking mercy outside of Christ is ultimately futile, since all grace, goodness, and mercy reside in Him alone. The rich man in hell demonstrates the tragic reality of this truth—once separated from Christ, there is no hope for mercy or grace. Therefore, believers are urged to seek the Lord while He may be found (Isaiah 55:6) because it is in Jesus that God's promises are fully realized. He is the cleft in the rock where grace abounds. For believers, coming to Christ is not merely an option; it is the imperative call of the gospel to trust in Him to receive the mercy that leads to salvation.
Scripture References:
Isaiah 55:6, John 14:6, Ephesians 1:3
Commentary