They are three distinct persons in one God. God's nature is not so easily defined. http://bible.com/100/jhn.1.1-14.nasb In the beginning was the Word, and the Word was with God, and the Word was God. And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth. http://bible.com/100/mat.3.16-17.nasb After being baptized, Jesus came up immediately from the water; and behold, the heavens were opened, and he saw the Spirit of God descending as a dove and lighting on Him, and behold, a voice out of the heavens said, "This is My beloved Son, in whom I am well-pleased."