“There is nothing in all the world more important to you than these truths:
(1) God is Trinity: Father, Son, and Holy Spirit. This is a great mystery— because we are not God and we cannot fully understand the sheer, wonderful, glorious mystery of His being. But we can begin to grasp it, and learn to love and adore Him.
(2) If you are a Christian, it is because of the loving thought and action of each person of the Trinity.
The Father, along with the Son and the Spirit, planned it before the foundation of the world; the Son came to pay the price for your redemption and, supported by the Holy Spirit, became obedient to His Father in your place, both in His life and death, to bring you justification before God; and now, by the powerful work of the Holy Spirit sent by both the Father and the Son, you have been brought to faith.
(3) The greatest privilege any of us can have is this: we can know God as Father, Son, and Holy Spirit. We can enjoy fellowship— what Owen calls ‘communion’— with God.
This knowledge is as rich, wide, deep, long, and high as are the three persons of God. Knowing Him and having fellowship with Him is an entire world of endless knowledge, trust, love, joy, fellowship, pleasure, and satisfaction.
This is what John Owen wanted Christians to know.”
–Sinclair Ferguson, The Trinitarian Devotion of John Owen (Sanford, FL: Reformation Trust, 2014), xvii.