With the pure you will show yourself pure; and with the devious you will show yourself shrewd.
Read Chapter 18
Augustine of Hippo
27. "And with the chosen Thou shalt be chosen." (ver. 26). And by him whom Thou choosest, Thou art chosen. "And with the froward Thou shalt be froward." And with the froward Thou seemest froward: for they say, "The way of the Lord is not right: " and their way is not right.
Perverted. No version can properly express this idea. God turns away from those who abandon him, treating every one according to his works. If we do not advance in piety, it is a sign that God perceives something amiss in us. (Berthier)
He cannot but abhor duplicity, and resist the wicked, Leviticus xxvi. 23, 40., and Proverbs iii. 34. He will make the craft of men turn against themselves, as he evinced in the case of Laban, Joseph's brethren, Pharao, and Saul. Sinners complain of him without reason, Ezechiel xviii. 25. (Calmet)
Some improperly use this text to shew, that people will adopt the manners of those with whom they associate, (Haydock) though it means that God will treat the good liberally, and the wicked with severity, Leviticus xxvi. 23, 24. (Amama) ...