John Trapp on Proverbs 21:29

Verſ. 29. A wicked man hardeneth his face] Procacitèr obfirmat vultum ſuum, ſo the Vulgar renders it. The falſe witneſs, verſ. 28. impudently defends, or at leaſt extenuates and excuſes his falſities. Frontem perfricat, aſſuens mendacium mendacio, as the Hebrew hath it, Pſal. 119.69. Hee thinks to make good one lye by another, to outface the truth, [non-Latin text not transcribed] Act. 27. to overbear it with a bold countenance. It ſeems to bee a metaphor from a Traveller that ſets his face againſt the wind and weather, and holds on his journey, though hee bee taking long ſtrides toward deſtruction.

But as for the upright hee directeth his way] Hee proceeds warily, weighs his words before hee utters them, and delivers nothing but the naked truth: And truth is like our firſt Parents, moſt beautiful when naked. Some Interpreters take this verſe, as ſetting forth the difference between the wicked and the godly, without any relation to the falſe and true witneſs, verſ. 28. And then it is Sententia ſapiente digna, ſaith one, Tam paucis verbis tam profundum ſenſum cumulans, a ſentence worthy of Solomon, as having ſo much in a little.