What does the Bible say about the unity of the Father and Son?

The unity of the Father and Son is a central theme in Scripture, particularly articulated in John 10:30 where Jesus declares, 'I and my Father are one.' This oneness signifies not merely a functional partnership but an essential unity in character, purpose, and divine power. According to historic Reformed theology, this unity is critical as it shapes our understanding of the Trinity—Father, Son, and Holy Spirit are distinct yet fully united in being and essence. This means that to see the Son is to see the Father, as stated in John 14:9, revealing that everything we know about God is through the revelation of Jesus Christ.