Who is like God? Who can bring the stars out each night and lead the earth in its dance around the Sun? Isaiah 40 challenges us that there is none like God, so we must take care lest our earthly experiences distort our knowledge of God. Nevertheless, God has left adequate witnesses that we may know him truly.
Standing in the presence of God on his throne in heaven, Isaiah gives the only appropriate response, "I am destroyed!" Yet in Isaiah 6, we see the very holiness that imperils Isaiah's life, a sinner as he is, is the grace that saves, for God unfailing acts to show mercy and to reveal his character, including the grace shown to cleanse sinners like Isaiah.
What hope do sinners have to be saved, when sin drives us away from God who offers mercy? Deuteronomy 30 shows that God will act to save his people, despite their rebellion and opposition. God's sovereignty is the promise, the hope that he can and will save sinners.
In Exodus 34, God reveals himself to be far more eager to show mercy than visit judgment. Moses was permitted a mere glimpse of the nature of God revealed, only his backside, but Paul shows us that in Jesus we see God face to face.
This excerpt from the book The Trinity and the Bible explores the logic of the biblical claim that God is one person and three persons.