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Christ first knew he was God:
A. at the presentation in the Temple, when his divinity was recognized by the holy man Simeon (Lk 2:29-32).
B. on the cross, when the Father's purpose was revealed fully as Christ said, it is finished" (Jn 19:30).
C. At the finding in the Temple, when the twelve-year-old Jesus said, "I must be about my Father's business" (Lk 2:49).
D. When the apostle Thomas, the doubter, saw the risen Christ and cried out, "My Lord and my God!" (Jn 20:28).
E. None of the above
What is E?
It is enough to realize that in Jesus Christ there are two natures (divine and human) but only one Person. That Person is the Second Person in the Trinity and therefore God. When we ask, "When did Jesus first know he was God?" we're asking, "When did this Person first know he was God?" It is a person (whether divine, angelic, or human) who knows, not a nature. Since God always has known he is God, the divine Person whom we call jesus Christ (God the Son) always has known himself to be God. Since persons know according to their natures, wee can distinguish the Second Person of the trinity's knowledge of himself as god by means of his divine nature from what he knew about himself by means of his human nature. By means of his divine nature, he has always known himself to be God, even if in his human nature (his human manner of knowing) this would not always have been the case.