Jesus said, “And when you pray, do not heap up empty phrases as the Gentiles do, for they think that they will be heard for their many words. Do not be like them, for your Father knows what you need before you ask Him. Pray then like this: ‘Our Father in heaven, hallowed be Your name. Your kingdom come, Your will be done, on earth as it is in heaven.’” (Matthew 6:7-10 ESV)
The Bible does not simply speak of God as 'one.' It speaks of God as a person. God is not like an abstract mathematical unit which is singular and stands by itself alone. We do not speak of God as an "it." We use a personal pronoun and speak of God as "He." The reason for this is that the Bible always speaks of God as a personal subject, as one who is in relation to another. God keeps His promises (Deuteronomy 4:31). He is merciful. He sees and hears His people (Exodus 3:7-8). He speaks and teaches (Genesis1:1; Deuteronomy 6:1). He loves (John 3:16). God can be angry (Deuteronomy 6:15). God can be long-suffering and patient (1 Peter 3:20). "It's" are none of those things.
-- Dr. Bill Weinrich, excerpted from an article entitled “One God in Three Persons,” published in “GOD WORDS: Intro to Classic Christian Theology”
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