Can you explain what you mean by that?
God is, because He is God, incomprehensible and unknowable. And thus there is the ineffability of God, meaning the general inability to talk about God because God is always infinitely bigger and higher than the thoughts we have and the words we use. For example, what is God? Well the only real answer that we can give is God is God. We can't compare God to anything, we can't say "God is like this" or "God is like that" because God isn't like anything in all of creation; He is entirely and completely other. So we can only say God is God, and that His being God is something completely alien to us, totally other, indescribable, incomprehensible, unfathomable.
In fact the only way we can really know God or say anything about Him is by revelation. This is often described as the Essence-Energies distinction. God in His Essence, His Being, is unknowable--I do not know what God is. God in His Energies (think of this as just a fancy way of saying "works" or "acts", the things God does and shows us) is knowable, when God comes to Moses through the burning bush and says, "I AM that I AM" for example. And most importantly, obviously, the Incarnation itself.
Historically Christianity has often "done" what is sometimes called Apophatic Theology, or Negative Theology; that is the Church says what God
is not. This is contrasted to Cataphatic Theology or Positive Theology, saying what God is. It's a very biblical way of doing theology, consider how often God in the Old Testament speaks about what He isn't, how He says things like, "What shall you compare Me to?" or "My thoughts are not your thoughts, neither are your ways My ways" etc. God's self-disclosure of Himself is often more about getting us to get rid of our wrong ideas about Him. After God delivered the Israelites out of Egypt what do they do? They give Aaron their gold jewelry and it gets melted down into the form of a golden calf, which they worship, saying this was the God that rescued them. But it wasn't, God isn't a golden calf, He can't be depicted, there is no form or shape or image that can represent Him. He's God, the real God, the real God isn't like the gods of Egypt, or the gods of the Canaanites. He's real, He's the I AM.
So the point in saying good theology is saying the least wrong thing about God is about understanding the poverty of human language, of how small and finite our minds, our understanding, our imagination is; and that when we confess God, we are confessing God as He comes to us. Not forming in our minds and imaginations our own golden calves, we don't reach up into glory to say what God is, we meet God as He comes down to us.
That's why the doctrine of the Trinity is beautiful, and also really frustrating. The doctrine of the Trinity isn't about us trying to define God, but about confessing God as God makes Himself known. It is to meet the Incarnate Jesus, the Son and Word of God, who refers to God His Father; that He is the Word who is in the beginning both God and with God. The Son is God with the Father who is God. And yet, God is one after all, "Hear O Israel the LORD your God, the LORD is one.", "There is no other god beside Me", "There is only one God" etc. Likewise, Jesus says, "I will ask the Father and He will send you another Comforter" the Holy Spirit. So there is this beautiful something that we encounter here, as God meets us, and while we cannot begin to comprehend the glory of This Mystery, That which made all things, fills all things, and is beyond all things; that Same Mystery meets us. The Unknowable becomes known. Not by strength, or power, or wisdom, or reason; but through love, compassion, grace, through the One who suffers for us, dying on the cross for us. Inviting us to know Him and His Father through Him, and the Spirit bearing the Father and the Son to us through the preaching of the Gospel, in the Sacraments, and our life together as God's people in the Church.
-CryptoLutheran