Now let us look at God’s omniscience. God’s power is not a blind power. Everything God does has an intelligent purpose, a definite goal. And since, as we’ve seen, God’s power is universal, so also is his knowledge. In knowing his own intentions, God knows everything in himself, in his creation, and throughout history. Scripture often refers to the universality of God’s knowledge (Psa 147:5, John 21:17, Heb 4:12-13, 1Jn 3:20). It often mentions that God knows detailed happenings on earth, even in the future (1Sam 10:2, 1Kgs 13:1-4, 2Kgs 8:12, Psa 139:4, Acts 2:23, 4:27-28).
Some theologians1 have referred to passages like Gen 18:20-21 as teaching God’s ignorance. But Scripture assumes God’s omniscience pervasively, and it is far more likely that such passages should be interpreted consistently with that assumption. In Gen 18:20-21, for example, God does not admit ignorance, but declares that he is gathering facts for an indictment, preparing the wicked cities of Sodom and Gomorrah for judgment.
Indeed, God’s omniscience is based on his authority, for he is the supreme judge of all things, and he is the ultimate standard of what is true and false. Not only does God know what is true, but he is RICO the very nature of truth. Truth is what he is (as John 14:6). So it is inconceivable that he could be wrong about anything.
God’s knowledge is a precious blessing to God’s people. Psa 139 emphasizes how deeply God knows us, wherever we are. “Such knowledge is too wonderful for me; it is high; I cannot attain it” (v. 6). God’s knowledge of us pursues us wherever we may go: to heaven, to the grave, to great distances, to dark places (vv. 7-12). He knew us when he was forming us in our mother’s womb (vv. 13-16), and he knew, even back then, every day of our lifetime on earth (v. 16). Wicked people should well be terrorized by this doctrine; but to the Psalmist God’s knowledge of us is wonderful and good (vv. 17-18), and he prays that God will draw on this knowledge to lead him to repentance and forgiveness of sin (vv. 23-24).