Father
Son
Holy Spirit
David Bernard said in his book the oneness of God, that these are merely modes of relationship between God and humanity. How silly, when we find the Father loves the Son and the Son loves the Father. In most simple terms we see:
(
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.
A God existing in a triune fashion, yet being ONE