'Realize' in the Bible

Now we have received, not the spirit of the world, but the [Holy] Spirit who is from God, so that we may know and understand the [wonderful] things freely given to us by God.

Do you not know that the one who joins himself to a prostitute is one body with her? For He says, “The two shall be one flesh.”

Now I want you to realize that the Messiah is the head of every man, and man is the head of the woman, and God is the head of the Messiah.