The egg is comprised of three parts: The yellow yolk, the whitish part, and the shell. Despite these three (3) substances, the egg is not three but one. Likewise, we believe that God the Father, God the Son, and God the Holy Ghost are one God, but made of three persons - hence they are ONE IN TRINITY - Gen.1:16-29; Matt. 3:16-17; Matt. 18:19.