Who is God?

Whatever comes into our minds when we think about God is the most important thing about us. - A. W. Tozer, The Knowledge of the Holy

I am the Lord; there is no other God. I have equipped you for battle, though you don’t even know me, so all the world from east to west will know there is no other God. I am the Lord, and there is no other. I create the light and make the darkness. I send good times and bad times. I, the Lord, am the one who does these things. “Open up, O heavens, and pour out your righteousness. Let the earth open wide so salvation and righteousness can sprout up together. I, the Lord, created them. This is what the Lord says—the Holy One of Israel and your Creator: “Do you question what I do for my children? Do you give me orders about the work of my hands? I am the one who made the earth and created people to live on it. With my hands I stretched out the heavens. All the stars are at my command. For the Lord is God, and he created the heavens and earth and put everything in place. He made the world to be lived in, not to be a place of empty chaos. “I am the Lord,” he says, “and there is no other. Consult together, argue your case. Get together and decide what to say. Who made these things known so long ago? What idol ever told you they would happen? Was it not I, the Lord? For there is no other God but me, a righteous God and Savior. There is none but me. Let all the world look to me for salvation! For I am God; there is no other. - Isaiah 45:5-8,11-12,18,21-22 (NLT)

Then Moses said to God, “Behold, I am about to come to the sons of Israel, and I will say to them, ‘The God of your fathers has sent me to you.’ And they will say to me, ‘What is His name?’ What shall I say to them?” And God said to Moses, “I AM WHO I AM”; and He said, “Thus you shall say to the sons of Israel, ‘I AM has sent me to you.’” And God furthermore said to Moses, “Thus you shall say to the sons of Israel, ‘Yahweh, the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you.’ This is My name forever, and this is My memorial-name from generation to generation. - Exodus 3:13-15 (LSB)

The following are excerpts from the book The Knowledge of the Holy by A. W. Tozer.
When we try to imagine what God is like we must of necessity use that-which-is-not-God as the raw material for our minds to work on; hence whatever we visualize God to be, He is not, for we have constructed our image out of that which He has made and what He has made is not God. If we insist upon trying to imagine Him, we end with an idol, made not with hands but with thoughts; and an idol of the mind is as offensive to God as an idol of the hand.
Left to ourselves we tend immediately to reduce God to manageable terms. We want to get Him where we can use Him, or at least know where He is when we need Him. We want a God we can in some measure control. We need the feeling of security that comes from knowing what God is like, and what He is like is of course a composite of all the religious pictures we have seen, all the best people we have known or heard about, and all the sublime ideas we have entertained.
If all this sounds strange to modern ears, it is only because we have for a full century taken God for granted. The glory of God has not been revealed to this generation of men. The God of contemporary Christianity is only slightly superior to the gods of Greece and Rome, if indeed He is not actually inferior to them in that He is weak and helpless while they at least had power.
The yearning to know What cannot be known, to comprehend the Incomprehensible, to touch and taste the Unapproachable, arises from the image of God in the nature of man. Deep calleth unto deep, and though polluted and landlocked by the mighty disaster theologians call the Fall, the soul senses its origin and longs to return to its Source. How can this be realized?
The answer of the Bible is simply "through Jesus Christ our Lord." In Christ and by Christ, God effects complete self-disclosure, although He shows himself not to reason but to faith and love. Faith is an organ of knowledge, and love an organ of experience. God came to us in the incarnation; in atonement He reconciled us to Himself, and by faith and love we enter and lay hold on Him.

This is a trustworthy saying, and everyone should accept it: “Christ Jesus came into the world to save sinners”—and I am the worst of them all. But God had mercy on me so that Christ Jesus could use me as a prime example of his great patience with even the worst sinners. Then others will realize that they, too, can believe in him and receive eternal life. All honor and glory to God forever and ever! He is the eternal King, the unseen one who never dies; he alone is God. Amen. - I Timothy 1:15-17 (NLT)

Immortal, invisible, God only wise,
in light inaccessible hid from our eyes,
most blessed, most glorious, the Ancient of Days,
almighty, victorious, thy great name we praise.

Unresting, unhasting, and silent as light,
nor wanting, nor wasting, thou rulest in might;
thy justice like mountains high soaring above
thy clouds, which are fountains of goodness and love.

To all life thou givest, to both great and small;
in all life thou livest, the true life of all;
we blossom and flourish as leaves on the tree,
and wither and perish but naught changeth thee.

Great Father of glory, pure Father of light,
thine angels adore thee, all veiling their sight;
all praise we would render, O help us to see
'tis only the splendor of light hideth thee. - Walter C. Smith

Be Encouraged to know God through Jesus Christ our Lord.