Psalm 14 begins with a thought-provoking statement, "The fool has said in his heart, 'There is no God.'" The word fool here does not refer to a mental deficiency but to a spiritual state that refuses to acknowledge the existence and sovereignty of God. Psalm 14 also shows the likely natural progression of a life alienated from God which can easily lead to a downward spiral as can be gleaned from the descriptions the psalmist uses like "corrupt" and "abominable works." The Bible does not set out to prove the existence of God but rather it affirms and declares it to be so in a clear and unambiguous and unapologetic manner. The first passage of the Scriptures alone states, "In the beginning God..." - an uncompromising statement which debunks all other theories antithetical to God.
Psalm 14:13 is a truth restated in the New Testament: "There is none who does good, no, not one." This truth is foundational in our understanding of true salvation where as born sinners we are desperately in need of a Savior. We may try to be good, do charitable acts, or go to church to obtain salvation, but apart from experiencing an inward transformation through faith in God's own Son, we will never attain salvation simply because on our own it will never be enough - even in our best form we will always fall short.
Towards the end of Psalm 14, David expresses his desire to see his nation's deliverance when he stated, "Oh, that the salvation of Israel could come out of Zion!" There will be a future national deliverance for the Jewish people, but for those who are longing for personal salvation, it can be had now, for the Word of God declares, "Now is the accepted time, now is the day of salvation" (2 Corinthians 6:2).