In detail, and by way of illustration:
aa) His knowledge is absolutely comprehensive:
Prov. 15:3—"The eyes of the Lord are in every place, keeping watch upon the evil and the good." How could He reward and punish otherwise? Not one single thing occurring in any place escapes His knowledge. 5:21—"For the ways of man are before the eyes of the Lord, and he pondereth all his goings." We may have habits hidden from our fellow creatures, but not from God.
bb) God has a perfect knowledge of all that is in nature:
Psa. 147:4—"He telleth the number of the stars; he calleth them all by their names." Man cannot (Gen. 15:5). How, then, can Israel say, "My way is hid from the Lord?" Cf. Isa. 40:26, 27. Matt. 10:29—"One … sparrow shall not fall to the ground without your Father." Much less would one of His children who perchance might be killed for His name's sake, fall without His knowledge.
cc) God has a perfect knowledge of all that transpires in human experience:
Prov. 5:21—"For the ways of man are before the eyes of the Lord, and he pondereth all his goings." All a man's doings are weighed by God. How this should affect his conduct! Psa. 139:2, 3—"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." Before our thoughts are fully developed, our unspoken sentences, the rising feeling in our hearts, our activity, our resting, all that we do from day to day is known and sifted by God. v. 4—"There is not a word in my tongue, but lo, O Lord, thou knowest it altogether." Not only thoughts and purposes, but words spoken, idle, good, or bad. Exod. 3:7—"I have seen the affliction….heard the cry: know the sorrows of my people which are in Egypt." The tears and grief which they dared not show to their taskmasters, God saw and noted. Did God know of their trouble in Egypt? It seemed to them as though He did not. But He did. Matt. 10:29, 30—"But the very hairs of your head are all numbered." What minute knowledge is this! Exod 3:19—"And I am sure that the king of Egypt will not let you go, no, not by a mighty hand." Here is intimate knowledge as to what a single individual will do. Isa. 48:18—"O that thou hadst harkened to my commandments! then had thy peace have been as a river," etc. God knows what our lives would have been if only we had acted and decided differently.
dd) God has a perfect knowledge of all that transpires in human history.
With what precision are national changes and destinies foretold and depicted in Dan. 2 and 8! Acts 15:18—"Known unto God are all his works from the beginning of the world (ages)." In the context surrounding this verse are clearly set forth the religious changes that were to characterize the generations to come, the which have been so far literally, though not fully, fulfilled.
ee) God knows—from, all eternity to all eternity what will take place.