John Trapp on Proverbs 29:9

Verſ. 9. If a wiſe man contendeth with a fooliſh man] Such fools were the Phariſees (though for their worldly wiſdome called Princes of this world, 1 Cor. 2.8.) Matth. 11.16, 17. Chriſt piped to them, John mourned to them, neither wrought upon them: ſuch was their peeviſhneſs and pertinacy in evil, that they rejected the counſel of God againſt themſelves, Luk. 7.30. being ingrati gratiae Dei, as Ambroſe hath it, receiving the grace of God in vain, as Paul, turning good nouriſhment into vitious humours, as foul ſtomacks uſe to doe: And as Wine a ſtrong remedy againſt Hemlock, yet mingled with it, doubles the force of the poyſon: ſo was it with the moſt powerful means of grace, mingled with their obſtinacy and unbelief. Tigers are enraged with perfumes, and Vultures killed with Oyl of Roſes, as Ariſtotle writeth.