The following illustration is overly simplistic, but it makes the birth of the Son of God a little easier to understand. As a human son receives his body and his very being from his father, so the Son of God, born of the Father, receives his divine essence and nature from the eternal Father. But this or any other illustration can never adequately describe how the divine majesty can be given to another, as when the Father gives his entire divine essence to the Son. A human father can't give his entire being to his son. This is where the comparison breaks down.
However, as far as the divine being is concerned, all of God's divine essence and nature passes into the Son. Yet the Son, who remains in the divine being together with the Father, is one God together with the Father. Likewise, the Holy Spirit has the same divine nature and majesty as the Father and the Son.
You must simply believe this. No matter how clever, sharp, or intelligent a person may be, the human mind will never be able to fully comprehend it. If human wisdom were able to grasp this, then God wouldn't have needed to reveal it from heaven or announce it through Holy Scripture. So you should say, "Even though I can't completely comprehend it, I believe and confess that there is one eternal God, who is also three distinct persons. Holy Scripture is God's Word and says that this is the way it is. I will live by what it says."
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