The Father, Son, Holy Spirit are Yahweh by nature (co-equal, co-essential, co-eternal), yet personally distinct. The Father is God, the Son is God, the Spirit is God, yet the Father is not the Son, the Son is not the Spirit, the Spirit is not the Father. Within the one eternal, uncreated spirit of God (nature, ontology, metaphysics, substance, essence) are 3 personal distinctions, not 3 gods, not 3 persons in 1 person. We must not confuse nature and personal distinction lest we fall into modalism, Arianism, or polytheism.