King James Version
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.English Standard Version
yet do it with gentleness and respect, having a good conscience, so that, when you are slandered, those who revile your good behavior in Christ may be put to shame.New International Version
keeping a clear conscience, so that those who speak maliciously against your good behavior in Christ may be ashamed of their slander.