Ps. 14 presents a highly compressed picture of general moral decadence in a godless world, with the assurance that God is with the righteous. The psalm appears again with slight variations as Ps. 53 (see comments there).
On the superscription see p. 616.
Fool.
Heb. nabal, a person deficient either morally or intellectually, or both. The nabal here seems to be one who lacks wisdom, a knowledge of moral values, spiritual insight—one who is color blind to moral and religious values—one who is a materialist, judging values by size and power. The best commentary on the “fool” is the book of Proverbs.
There is no God.
The fool may profess God for social and business purposes, but “in his heart” there is no room for a belief in God (see Rom. 1:20, 21).
None that doeth good.
The picture is one of total depravity, emphasized by the following verses. Sections of vs. 1-3 are quoted by Paul to prove that both Jews and Gentiles are under sin (Rom. 3:10-12).