The term 'fully divine' refers to the complete and total nature of Jesus Christ's divinity, asserting that he possesses the same divine essence as God the Father. This concept is central to understanding Christology, as it establishes that Jesus is not merely a human being with some divine qualities but is entirely and wholly God in nature. This belief is crucial for various Christian doctrines, including the Trinity and the Incarnation, highlighting the complexity of Jesus' identity as both fully God and fully man.