"O Lord, thou hast searched me, and known me. Thou knowest my downsitting and mine uprising, thou understandest my thought afar off. Thou compassest my path and my lying down, and art acquainted with all my ways. For there is not a word in my tongue, but, lo, O Lord, thou knowest it altogether. Thou hast beset me behind and before, and laid thine hand upon me.Such knowledge is too wonderful for me; it is high, I cannot attain unto it. Whither shall I go from thy spirit? or whither shall I flee from thy presence? If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.If I take the wings of the morning, and dwell in the uttermost parts of the sea; Even there shall thy hand lead me, and thy right hand shall hold me. If I say, Surely the darkness shall cover me; even the night shall be light about me. Yea, the darkness hideth not from thee; but the night shineth as the day: the darkness and the light are both alike to thee. For thou hast possessed my reins: thou hast covered me in my mother's womb. I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well. My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth. Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there was none of them.
How precious also are thy thoughts unto me, O God! how great is the sum of them!
In this psalm we see how many facts God knows about us but it is only a small part because God has far more knowledge about us but it is practically impossible to express in words and we see here that God knows when we sit, when we get up, what we do, how we do , he knows all our ways, all our words we have spoken, he writes that he knows even our thoughts, further we can see that God knows the past, present and future, he knows everything about us even before our birth, etc. This clearly indicates that nothing we cannot do without God knowing this and this only applies to us humans who are only a small part of God's omniscience,
Here are some examples that are close to us from life, something that everyone can understand because not all people are scientists or academic citizens, there are far more "ordinary" people, especially this has been the case throughout history, and the Bible is written in simple, understandable language. everyone to understand it.
And from this it is clear and everyone can understand that God is omniscient.
“[There is] none holy as the LORD: for [there is] none beside thee: neither [is there] any rock like our God. Talk no more so exceeding proudly; let [not] arrogancy come out of your mouth: for the LORD [is] a God of knowledge, and by him actions are weighed."
1 Sam.2: 2-3
Here, these verses confirm again that God Almighty had a practical lesson here, friendly advice from God, and it refers to our life, it refers to what we do, how we do it and what we say, because God knows everything we do, so if we do we refuse to live according to God's will and we will be to blame for that and one day we will bear the consequences. Of course God does not want to force us to do something by force, it is our choice but it is great wisdom to listen to the advice God gives us because God does not want to whoever dies already for all to live and that is the meaning of the word "repentance":
"The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
2 Pet.3: 9
Let's see a few more practical examples related to people and related to God's omniscience.
God knows that we are just people and that very often we think one thing and do another or want to do one thing and in life another scenario comes out and we do something completely different and this is something that happens every day. Although some of these things, only we know "we should remember that this is not true because besides us God knows it too, so that fact should encourage us to do things like this less and less every day and it would be a sign that we are slowly approaching God through that process. True, we will never be "perfect" as long as we live on earth, but for a start it is enough for our mind and reason to "work" on our actions and see that it is the opposite of what God wants, and then the next step is to confess those sins. that way we harmonize our will with the will of God because the least that God expects from us is to confess our sins and believe in the Lord Jesus Christ. That is why it says that God "suffers" us and in that way practically gives us a chance to grow slowly and become at least a little "similar" to what our goal is and that is written in Matthew 48 heads:
"Be ye therefore perfect, even as your Father which is in heaven is perfect.“
Of course, this does not mean that we will be our human effort to be "perfect", we should strive to live as "perfect" as possible, and only we can be perfect in the eyes of God while we are here on earth through the Lord Jesus Christ who redeemed us and justified.
"By the which will we are sanctified through the offering of the body of Jesus Christ once [for all]. And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins: But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;”
And when we are redeemed by grace and justified through the Lord Jesus Christ, then the righteousness of Jesus is taken into account and we are accepted as perfect by God the Father, not because we have done something but because of what Jesus did for us.
"For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.”
"For he hath made him [to be] sin for us, who knew no sin; that we might be made the righteousness of God in him.”
2 Cor.5: 21
We have seen that God knows our thoughts in Ps.139 and we can say that it is very often problematic for us humans, especially lately, that we are dissatisfied and that we often complain about various things, actions, events or people around us without thinking that God observes and hears our dissatisfaction.
We have a similar example recorded and it refers to the people of Israel who were in the desert and who probably grumbled, got angry and shouted at the difficult conditions in the desert and God thinking that no one heard them, but we also have a record of what God said.
"How long [shall I bear with] this evil congregation, which murmur against me? I have heard the murmurings of the children of Israel, which they murmur against me.”
"But I know thy abode, and thy going out, and thy coming in, and thy rage against me. Because thy rage against me and thy tumult is come up into mine ears, therefore I will put my hook in thy nose, and my bridle in thy lips, and I will turn thee back by the way by which thou camest.”
2 Kings.19: 27-28
We see that God knew what they were doing and thinking even though they were in the desert far from everything and today we need to ask ourselves what is wrong with our grumbling and anger because we have an incredibly large amount of lawlessness and sin around us today and therefore we have many more potential situations to do what we would not want to do and what God does not want us to do and that is sin. And we see where Job says that God sees all our steps and Isaiah talks about thoughts.
"For his eyes [are] upon the ways of man, and he seeth all his goings. [There is] no darkness, nor shadow of death, where the workers of iniquity may hide themselves.”
Job 34: 21-22
,,For I [know] their works and their thoughts:...”
In this situation, the smartest and simplest solution is to admit sin and not look for a philosophical solution because we will run into an even bigger problem.
"If we confess our sins, he is faithful and just to forgive us [our] sins, and to cleanse us from all unrighteousness.”
1 Job 1: 9
So God's standard is far above the human one, and since God is omniscient, He also sees our thoughts and prayers that often lead us to sin, because we as humans look and judge someone or something by how someone or something looks or does and God sees to the heart because thoughts come out of it and help as it is written in Mark:
"For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: All these evil things come from within, and defile the man."
And every thought is known to God
,, ... know the God of your father, and serve him with all your heart and soul; for the Lord examines all hearts and knows every thought; ... "
,,And thou, Solomon my son, know thou the God of thy father, and serve him with a perfect heart and with a willing mind: for the Lord searcheth all hearts, and understandeth all the imaginations of the thoughts:…”
1 Chronicles 28: 9
And all our secrets are secrets only for us and they are known to God because it says:
"Thou hast set our iniquities before thee, our secret sins in the light of thy countenance. Ps.90: 8
"Shall not God search this out? for he knoweth the secrets of the heart."
Apart from this, God knows all our needs, weaknesses, torments, insults, worries ... and before that we ask Him for something from that.
“Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him."
"When my spirit faints within me."
,,You see; because you see insults and torments and write them on your hand ... "
It is also important to say that God knows all His own who will never perish because Jesus keeps them as a Shepherd.
"The Lord is good, the city is in trouble, and He knows those who trust in Him."
Nahum 1: 7
"I am a good shepherd, and I know mine, and mine know me. As the Father knows me, so I know the Father; and I lay down my life for the sheep. "
John 10: 14-15
"My sheep hear my voice, and I know them, and they follow me. And I will give them eternal life, and they will never perish, and no one will snatch them from my hand."
John 10: 27-28
"... The Lord knows his own; ..."
2 Tim.2: 19
and for them the Lord Jesus prays to the Father
"I pray for them: I do not pray for (all) the world, but for those whom You have given me, because they are Yours. And mine is all Yours, and Yours is mine; and I am glorified in them. And I am no longer in the world, and they are in the world, and I go to You. Holy Father! Preserve them in your name, those you have given me, that they may be one as we are. "
John 17: 9-11
Finally, let us mention that God knows everything about our planet, creatures on it, heaven, hell, stars, galaxies, forces that act and with which it maintains our entire environment, and God knows other things, processes and events that we do not we cannot even imagine because He is God omniscient and we are only His creatures who can only ask:
"Who measured the water with his hands and measured the heavens?" Who measured the dust of the earth with a measure, and measured the measure of the mountains and the hills above, who made the Spirit of the Lord? Or was he his counselor, and taught him? With whom did he agree, and who made him wise, and taught him the way of judgment?
The answer is simple, no one because He is God omniscient
"For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD; but as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts."