“Lastly, here is ‘in Christ Jesus‘ added, for all God’s kindness, and all His grace towards us, is in Christ (Ephesians 2:7).
It is an infinite magnifying of the Lord Jesus, that He alone, being in heaven, is able enough and worthy enough to take into His possession all the glory and all the grace that ever God means to bestow upon His children.
He hath done it, my brethren.
Had not He been a person answerably glorious, we could not have been said to sit in heavenly places in Christ Jesus, or that the riches of His grace should be shown in His kindness toward us in Him.
But so great a person is Jesus Christ, God and man, that look as the sun, if there were ten hundred thousand stars more to be created, and the heavens to be filled with them all, there is light enough in the sun to enlighten them all; so there is in Christ.
And therefore, my brethren, never think to set up without this Lord Jesus Christ.
Do not think that He only serveth to bring you unto God, and there to leave you. No, He will never leave you to eternity.
All the kindness that God shows you to eternity is in Christ Jesus.”
–Thomas Goodwin, “Sermon 19: Ephesians 2:7,” The Works of Thomas Goodwin, Volume 2 (Grand Rapids, MI: Reformation Heritage, 1861/2006), 2: 293–294.