1 Corinthians 8:6, One Lord Jesus Christ
There is but one God. The mathematical representation of our God is not 1+1+1. For 1+1+1=3, rather its 1x1x1=1. One God manifesting Himself in three Persons – God the Father is God, God the Son is God and God the Holy Spirit is God.
1 John 5:7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
Mind-boggling yet most blessed truth that we receive by faith.