Matthew Poole and continuators on Ecclesiastes 9:18

18 Wisdom is better than weapons of war : but one sinner destroyeth much good .

Than armed power.

A wicked fool. By which expression and opposition of a Sinner to a wise Man he gives us a Key to understand his meaning in divers places of his Books, that by Wisdom he means true Piety, and by folly, wickedness: and withal sheweth that sin as it is the greatest folly, so it is more pernicious to men than meer [illegible: 1+ letters]olly properly so called.

By his wicked counsels and courses brings much damage and mischief both to himself and others.