Christians pray to the one Jesus called Father, with Jesus the Son, who has the intrinsic right to do this, and as we thus enter the relation between them, we pray in the Spirit, who is that relation of mutual love. When I am asked to explain the Trinity, I often ask, 'Do you know how to pray the Lord's Prayer?' If the answer is 'Yes,' I then reply, 'Then you do understand the Trinity.'
Robert Jenson