having a good conscience; that, while you are spoken against as evildoers, they may be disappointed who curse your good manner of life in Christ.
This verse implies that at least some who call for an explanation of our faith may be unfriendly. They may approach us with a "chip-on-the-shoulder" attitude, which explains why the preceding verse instructs us to be meek and respectful; if we observe all these instructions we can have a good conscience. When the critics make their approach with the questions, they often imply that no good reason can be given for the conduct of the disciples because they (the disciples) are evildoers so they will say. But when the reasons are shown to be well founded in the word of God it will put to shame the false accusers.