While the word trinity does not appear in Scripture, the concept very clearly does.  Tertullian (Early church father AD155-220) was the first to use the word trinity in effort to summerize a great amount of biblical truth.  To say that God exists as a trinity does not mean there are three Gods, or that one God merely manifests himself as either Father, Son, and Holy Spirit on various occasions.

The Westminister Confession of Faith (1647) summarizes the doctrine by saying “In the unity of the Godhead there be three persons, of one substance, power, and eternity: God the Father, God the Son, and God the Holy Ghost.”  Wayne Grudem defines the doctrine of the Trinity as follows, “God eternally exists as three persons, Father, Son, and Holy Spirit, and each person is fully God, and there is one God.”

 “The Trinity is one God who eternally exists as three distinct persons - Father, Son, and Spirit - who are each fully and equally God.  Person does not mean that God the Father or God the Spirit became human beings.  Rather, it means that each member of the Trinity thinks, acts, feels, speaks, and relates because they are persons and not impersonal forces.  Further, each member of the Trinity, is equally God, which means that they share divine attributes, such as eternally, omniscience, omnipotence, and omnipresence.  The doctrine of the Trinity seeks to hold all of the truth that God says himself in Scripture, such as the following truths, without dismissing or diminishing any truth.”   Mark Driscoll

Check out these passages:

• Luke 1:35
• Matthew 3:16-17
• Matthew 28:19-20

God is truly amazing!