The Trinity

...In ‘the Holy Trinity we have to do with God himself, not just modal ways of thinking about God, for the One true God is actually and intrinsically Triune and cannot be truly conceived otherwise. There is in fact no real knowledge of God except through his revealing or naming of himself as Father, Son and Holy Spirit, for the three Persons are the One true God. The only God there is, is he who has named himself to Israel as ‘I am who I am/I will be who I will be’, and who as the same Lord has personally come to us as ‘God with us’, clothed with his triune self-revelation and self-designation as Father, Son and Holy Spirit. The transcendent God who is the free ground of his own eternal Being is none other than the very one who has shown us his face in the Jesus Christ and imparted to us his one Spirit. He is the one Lord God of heaven and earth in whom we believe and whom we worship as Father, Son and Holy Spirit.

Thomas Torrance, The Christian Doctrine of God, 15-16.