Jeremiah Burroughs, English Puritan pastor (1599-1646), from his sermon Christ is All, and In All:

Christ is all in all in the lack of things, whatever it is that we lack. Do we lack grace, do we lack gifts, do we lack outward comforts in the world? There is enough in Christ. It is Christ that is instead of all, that is better than all, and that will supply all in His due time. Those who know Christ and have acquaintance with Him, though they have this and that comfort taken from them, they still know how to make supply out of Christ. They have that skill and art and mystery of godliness that they can make Christ to be all in all in the lack of all, and it is a great skill and mystery of godliness to know how to make up all in Christ in the lack of all.

Again, to the saints, Christ is all in all in the enjoyment of all. When they enjoy never so much of the creature comforts, Christ is all in all to them. The satisfaction that their souls have is not that they have larger estates, more friends, or greater comforts than others, but that they know how to enjoy Christ in all, and can look upon it as a fruit of the covenant that God made with them in Christ and as coming down from the fountain of God’s eternal love and mercy in His Son.