The Fool.

Say's in his heart, 'there is No God.'  Psalm 14:1.

There are plenty of people today in our societies, clever, intelligent and arrogant who would make the same claim openly.

Here we have a man, who is saying it in his heart and it is only God who knows our hearts and minds, our thoughts. Hebrews 4:12-13.

God tells us to wise up and not bother listening to the fool, the unwise and silly people. This is because they will lead us into their own folly.  
Proverbs 1:7, Isaiah 9:17, Matthew 25:3.

What we need to do is seek God and His ways to get a better life. Amos 5:4, 14-15.