“The oil of joy makes the wheels of obedience move faster.
Christ died to purchase this joy for His saints: He was a man of sorrow that we may be full of joy.
He prays that the saints may have this divine joy, ‘And now I come to Thee, that they may have My joy fulfilled in themselves,’ (John 17:13).
And this prayer He now prays in heaven. He knows we never love Him so much as when we feel His love, which may encourage us to seek after this joy.
We pray for that which Christ Himself is praying for when we pray that His joy may be fulfilled in us.”
–Thomas Watson, A Body of Divinity Contained in Sermons Upon the Westminster Assembly’s Catechism (Carlisle, PA: Banner of Truth, 1692/1970), 271.