1 Peter 3:15-16

But in your hearts set Christ apart as holy [and acknowledge Him] as Lord. Always be ready to give a logical defense to anyone who asks you to account for the hope that is in you, but do it courteously and respectfully. [Isa. 8:12, 13.] [And see to it that] your conscience is entirely clear (unimpaired), so that, when you are falsely accused as evildoers, those who threaten you abusively and revile your right behavior in Christ may come to be ashamed [of slandering your good lives].