to the pure you show yourself pure, but to the devious you show yourself shrewd.
NMVWith the pure youi will show yourself pure; and with the perverse (twisted) [habitually disposed to disobedience and opposition] youi will show yourself unsavoury.
OJBWith the pure Thou wilt show Thyself pure; and with the ikkesh (crooked, devious) Thou wilt show Thyself shrewd.
RVWith the pure thou wilt shew thyself pure; and with the perverse thou wilt shew thyself froward.
T4TYou act sincerely toward those whose inner beings are pure, but you are hostile to those who are perverse/wicked.