Logic and God
It will be best to begin by calling attention to some of the characteristics the Scriptures attribute to God. Nothing startling is involved in remarking that God is omniscient. This is a commonplace of Christian theology. But, further, God is eternally omniscient. He has not learned his knowledge. And since God exists of himself, independent of everything else, indeed the Creator of everything else, he must himself be the source of his own knowledge. This important point has had a history.
At the beginning of the Christian era, Philo, the Jewish scholar of Alexandria, made an adjustment in Platonic philosophy to bring it into accord with the theology of the Old Testament. Plato had based his system on three original, independent principles: the World of Ideas, the Demiurge, and chaotic space. Although the three were equally eternal and independent of each other, the Demiurge fashioned chaotic space into this visible world by using the Ideas as his model. Hence in Plato the World of Ideas is not only independent of but even in a sense superior to the maker of heaven and earth. He is morally obligated, and in fact willingly submits, to the Ideas of justice, man, equality, and number.
Philo, however, says, "God has been ranked according to the one and the unit; or rather even the unit has been ranked according to the one God, for all number, like time, is younger than the cosmos, while God is older than the cosmos and its creator."
This means that God is the source and determiner of all truth. Christians generally, even uneducated Christians, understand that water, milk, alcohol, and gasoline freeze at different temperatures because God created them that way. God could have made an intoxicating fluid freeze at zero Fahrenheit and he could have made the cow's product freeze at forty. But he decided otherwise. Therefore behind the act of creation there is an eternal decree. It was God's eternal purpose to have such liquids, and therefore we can say that the particularities of nature were determined before there was any nature.
Similarly in all other varieties of truth, God must be accounted sovereign. It is his decree that makes one proposition true and another false. Whether the proposition be physical, psychological, moral, or theological, it is God who made it that way. A proposition is true because God thinks it so.
Perhaps for a certain formal completeness, a sample of Scriptural documentation might be appropriate. Psalm 147:5 says, "God is our Lord, and of great power; his understanding is infinite." If we cannot strictly conclude from this verse that God's power is the origin of his understanding, at least there is no doubt that omniscience is asserted. 1 Samuel 2:3 says "the Lord is a God of knowledge." Ephesians 1:8 speaks of God's wisdom and prudence. In Romans 16:27 we have the phrase, "God only wise," and in 1 Timothy 1:17 the similar phrase, "the only wise God."
Further references and an excellent exposition of them may be found in Stephen Charnock, The Existence and Attributes of God, chapters VIII and IX. From this distinguished author a few lines must he included here.
God knows himself because his knowledge with his will is the cause of all other things; ... he is the first truth, and therefore is the first object of his understanding.... As he is all knowledge, so he hath in himself the most excellent object of knowledge.... No object is so intelligible to God as God is to himself... for his understanding is his essence, himself. God knows his own decree and will, and therefore must know all things.... God must know what he hath decreed to come to pass.... God must know because he willed them ... he therefore knows them because he knows what he willed. The knowledge of God cannot arise from the things themselves, for then the knowledge of God would have a cause without him.... As God sees things possible in the glass of his own power, so he sees things future in the glass of his own will.
A great deal of Charnock's material has as its purpose the listing of the objects of God's knowledge. Here, however, the quotations were made to point out that God's knowledge depends on his will and on nothing external to him. Thus we may repeat with Philo that God is not to be ranked under the idea of unity, or of goodness, or of truth; but rather unity, goodness, and truth are to be ranked under the decree of God.
God & Logic