Psalm 147:4-5: He determines the number of the stars and calls them each by name.
5 Great is our Lord and mighty in power; his understanding has no limit.
Psalm 139: 1-4: You have searched me, Lord, and you know me. 2 You know when I sit and when I rise; you perceive my thoughts from afar. 3 You discern my going out and my lying down; you are familiar with all my ways. 4 Before a word is on my tongue you, Lord, know it completely.
Proverbs 15:3: The eyes of the Lord are everywhere, keeping watch on the wicked and the good.
It is amazing, and perhaps more than a little embarrassing in some cases, that God is omniscient.
Merriam-Webster defines omniscience as: possessed of universal or complete knowledge. The dictionary gives God as the only example of that. This means, in a nutshell: God knows everything all the time from the beginning of time and until the end of time about everything and everyone. He could give us a moment-by-moment running commentary, verbatim, of every single thought, every single action, and every single word of every single person in history and in the future. All at the same time, I might add. No software is going to solve that one. How might He do that? Beats me. He’s the Omniscient One.
Obviously, we do know stuff. Why is that?
Omniscience is one of the transferable or communicable attributes of God. This means he gives us a little bit of what he has all of. We can acquire knowledge, think, reason, delve, create, etc. But we will always be limited and imperfect in our acquisition and execution of knowledge.
Another important detail: the fact that God gives us a little bit of what He has by no means diminishes the knowledge He possesses.
It is not like only such much knowledge exists out there, so God gives us some, but He keeps the lion’s share. As if He only has only so much knowledge available, so since He shares it with us, His is depleted. No. He has made us in his image with the ability to reason and acquire knowledge, but the infinitesimal percentage doesn’t even exist to quantify our knowledge in comparison with his. It is a waste of time even to try. And He doesn’t continue to learn, either. He knows all that will ever be.
God is not only Independent (self-sustaining and doesn’t need us, but wants us), Immutable (does not change), Omnipresent (everywhere all the time in fullness), Eternal (no one created Him, and He always was and always will be), He knows absolutely everything–always has and always will.
These truths trigger an emotional response in me.
On the one hand I feel small and insignificant—the tiniest little speck in the midst of infinite nothingness and everythingness. But on the other, it leaves me breathless that the indescribable God is interested in this little speck. Not like a scientist might be in viewing an intriguing fleck under a microscope, but involved. Communicating, sharing, providing, loving, disciplining, blessing, rescuing, judging.
Remember what I am always driving home: God’s plan is to have a people and for Him to be their God. For that, all of the above is part of it.
How about you? What do you think about God also being Omniscient? Does it have any impact on your life? Please share your thoughts.
Colleen Shine Phillips 
Honestly, while it is sometimes an embarrassing thought that God knows everything I think and feel, most of the time it is a comfort. He knows my every action and motive, so nothing I do for Him gets overlooked either!
Remember how you mentioned the Superheroes the other day? Even the greatest Mind-Reader cannot match God for intimate knowledge of our innermost thoughts. Like David, I find that a blessing!
I so agree, Diane!! Thank you so much for your thoughtful insights.