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Teniendo buena conciencia, para que en lo que murmuran de vosotros como de malhechores, sean confundidos los que blasfeman vuestra buena conversación en Cristo.

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.

having a good conscience. Thus, while you are spoken against as evildoers, they may be disappointed who curse your good way of life in Christ.