Episode Details

In this foundational episode of The Reformed Brotherhood's systematic theology series, Tony and Jesse explore the doctrine of Christology—the study of who Jesus Christ is. Building on their previous discussions of the Trinity, they unpack the Chalcedonian Definition and the hypostatic union, explaining how Jesus can be fully God and fully man without confusion or division between His two natures. This episode addresses common misconceptions, tackles early Christological heresies, and demonstrates why getting Christ's identity right is essential for understanding Scripture, salvation, and the Christian life. Whether you're new to theology or deepening your knowledge, this conversation will ground you in the most important question of all: "Who do you say that I am?"

Key Takeaways

• The Hypostatic Union is Central: Jesus Christ is one person possessing two complete, distinct natures—fully divine and fully human—without confusion, change, division, or separation.
• The Incarnation is Addition, Not Subtraction: Christ did not give up any divine attributes (like omniscience or omnipresence) when He became man; He added a human nature to His divine nature.
• Christ Acts According to Each Nature: Jesus knows all things according to His divine nature but experienced genuine human limitations (including not knowing certain things) according to His human nature.
• The Chalcedonian Definition Protects Orthodoxy: The four key negations—without confusion, without change, without division, without separation—guard against heresy and preserve the biblical portrait of Christ.
• Christ's Humanity is Essential for Our Salvation: Only a true human could obey the law on our behalf and die in our place; only God could make that obedience and sacrifice of infinite worth.
• Systematic Theology Flows from Scripture: The technical language of Christology isn't philosophical overlay—it's the church's faithful attempt to systematize what the Bible reveals about Jesus.
• Proper Christology Impacts Everything: Getting Jesus' identity wrong creates theological errors that spread throughout your entire system—affecting how you read Scripture, understand salvation, and live the Christian life.

Expanded Explanation of Key Concepts Why the Hypostatic Union Matters for Daily Faith

The doctrine of the hypostatic union—that Jesus is one person with two natures—isn't academic abstraction. It's the key to reading the Gospels coherently. When Jesus says He doesn't know the day or hour of His return (Mark 13:32), we're not forced to choose between calling Him a liar or denying His deity. Instead, we understand that Jesus, as one person, knows all things according to His divine nature but experienced genuine human limitation according to His human nature. This distinction preserves both His truthfulness and His full divinity. Similarly, when we see Jesus praying, learning, growing, and suffering, we're witnessing the real humanity necessary for Him to be our representative and substitute. The hypostatic union isn't a puzzle to solve but a truth to worship: God became what we are (without ceasing to be God) so that we might become what He is (without ceasing to be human).

The Incarnation as Addition, Not Subtraction

One of the most dangerous errors in Christology is thinking that Jesus had to "give up" divine attributes to become human—a heresy known as kenotic theology. The Reformed response is clear: the incarnation involved addition, not subtraction. The eternal Son of God, who possessed all divine attributes from eternity, took on a complete human nature at a specific point in time. He didn't stop being omniscient; He added a human mind that learned and grew. He didn't stop being omnipresent; He added a human body located in space and time. This is critical because if the Son changed—if He became less than fully God—then He was never truly immutable, and therefore nev