NET
16 Yet do it with courtesy and respect, keeping a good conscience, so that those who slander your good conduct in Christ may be put to shame when they accuse you.
Darby
16 having a good conscience, that [as to that] in which they speak against you as evildoers, they may be ashamed who calumniate your good conversation in Christ.
KJV
16 Having a good conscience; that, whereas they speak evil of you, as of evildoers, they may be ashamed that falsely accuse your good conversation in Christ.