I can remember the first time I heard of the doctrine of union with Christ. I was sitting in a classroom in north Texas listening to Dr. Sinclair Ferguson lecture on the doctrine of salvation. He had us to turn to Ephesians 1 and asked a student to read it out loud to the class. Every time the student read the phrase “in Him,” he said in his deep Scottish voice: “IN HIM.”

When the student finished reading, he launched into 45 minutes on the beauty of the doctrine of union with Christ. I sat in the back of the room, tears in my eyes. I had been a Christian for 22 years and the gospel was surprising me yet again.

After class, in the student commons, Dr. Ferguson was chatting with students and I began to pepper him with questions about this doctrine.At one point, after what must have been my tenth question, Dr. Ferguson turned to me and said, “Young Mr. Worley, it’s all in Christ. Every blessing God has for His people. They are all in Christ. Where else would they be?”

He walked back into class, but I didn’t. I walked out of the building in a daze and I walked around the neighborhood for the next two hours. All I could think about was what Dr. Ferguson had said: “Every blessing God has for His people. They are all in Christ. Where else would they be?”

The doctrine of union with Christ changed my life. It changed the way I conceive of my relationship with God. It changed the way I read the Bible. It changed the way I pray. It changed the way I pastor. It changed everything.

Union with Christ

But, what is it? In 500 words or less, here’s how I would explain the doctrine of union with Christ:

Louis Berkhof defined union with Christ as that “intimate, vital, and spiritual union between Christ and His people, in virtue of which He is the source of their life and strength, of their blessedness and salvation.” That’s a really wonderful way of stating it.

This union is intimate in that it takes God’s people and places them into divine fellowship by placing them into the identity and under the covenant headship of the Son of God. It’s vital in that it is necessary for salvation. As John Calvin says concerning salvation, “We are deprived of this utterly incomparable good until Christ is made ours.” It is spiritual in that it is a “mystical” union, it isn’t some tangible thing we can see, but it is real nonetheless.

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