John Trapp on Proverbs 5:2

Verſ. 2. That thou mayeſt regard diſcretion] Or, that thou mayeſt keep in thy thoughts, as Job did, Chap. 31.1. Why then ſhould I think upon a Maid? Out of the hearts of men proceed evil thoughts, adulteries, fornications, &c. ſaith our Saviour, Mark. 7.21. Many mens hearts are no better than ſtews and brothel-houſes,Pſal. 104. by reaſon of baſe and beaſtly thoughts and luſts that muſter and ſwarm there, like the flies of Aegypt. There is that Leviathan, and there are creeping things innumerable. Yea, the hypocrite, who outwardly abſtains from groſs ſins, yet inwardly conſenteth with the theef, and partaketh with the Adulterer, that is, in his heart and fancy, ſuppoſing himſelf with them; and deſiring to do what they do, Pſal. 50.18, 19. This is mental adultery, this is contemplative wickedneſs. So it is alſo to recall former filthineſs with delight, Ezek. 23.21. Shee multiplied her whoredomes in calling to remembrance the daies of her youth, wherein ſhee had plaid the harlot. Surely as a man may dye of an inward bleeding; ſo may hee bee damned for theſe inward boilings of luſt and concupiſcence, if not bewailed and mortified, Jer. 4 14. The thoughts of the wicked are abominable to the Lord. Prov. 15.26. To look and luſt is to commit Adultery, Matth. 5.28. Therefore deſire not her beauty in thy heart. Prov. 6.25.

And that thy lips may keep knowledge] As Joſeph did in anſwering his wanton Miſtreſs, Gen. 39. as hee in St. Auſtin did, that replied to his minions, Ego ſum, It is I, At ego non ſum, but it is not I.