In Scripture, God tells us about Himself, and we learn that while there is only one God, He is three persons: Father, Son, and Holy Spirit. Now this whole three-in-one and one-in-three business known as the Trinity is downright mind-boggling. We do not arrive at our understanding of God because it is reasonable or logical or mathematically sound, but because it has been revealed to us in Scripture.
Both the Old and New Testaments state that there is only one God. We also learn that the one true God consists of more than one person. Genesis 1:26 says, “Let Us make man in Our image.” The three persons of the Trinity work together. A clear example of this is found at Jesus’ Baptism, where we see
- God the Son as an in-the-flesh human being,
- God the Holy Spirit in the form of a dove, and
- God the Father’s voice coming down from heaven.
Also, when Jesus commands Holy Baptism in Matthew 28:19, He tells the apostles to baptize in the name of the Father, Son, and Holy Spirit. The one, singular name God includes all three persons of the Trinity.
To learn more about the Trinity, and who God is, check out the book Lutheranism 101.