'Self confident' in the Bible

“Save me from all my transgressions;Do not make me the scorn and reproach of the [self-righteous, arrogant] fool.

For he sees that even wise men die;The fool and the stupid alike perishAnd leave their wealth to others.

I will hear [with expectant hope] what God the Lord will say,For He will speak peace to His people, to His godly ones—But let them not turn again to folly.

A senseless man [in his crude and uncultivated state] knows nothing,Nor does a [self-righteous] fool understand this:

Consider thoughtfully, you senseless (stupid ones) among the people;And you [dull-minded] fools, when will you become wise and understand?