I like to describe the Trinity in terms of 1 Timothy 2:5, There is one God and one mediator between God and mankind, the man Christ Jesus. IOW, Jesus is God in the human dimension. The Holy Spirit is the way God indwells believers per 1 Corinthians 12:13, We were all baptized by one Spirit into one body. We can denote the Trinity by the use of three prepositions: God the Father is over all creation (EPH 4:6), God the Son is Immanuel or with humanity (MT 1:23), and God the Holy Spirit is within all believers (EPH 1:13).