Acts 26:24 That was too much for Festus. He interrupted with a shout: “Paul, you’re crazy! You’ve read too many books, spent too much time staring off into space! Get a grip on yourself, get back in the real world!” (The Message Bible)
You can read the whole of chapter 26 to get the background of this statement. Suffice for now that Paul was trying to explain his faith and his experience to this Festus who was a high governmental official. Festus’ response? “Paul, you’re crazy.” Let’s face it, there are those who think people of faith are delusional. They see the stories of the Bible as fantasies or worse and those who believe there is truth in them as mentally impaired. Sure, some things are hard to understand. So are black holes, quarks and calculus for many people. If by faith we are saying that there are some things we think are real and true even though we don’t fully understand everything about them, then, unless you have complete knowledge of everything, which no one does, you have faith in someone or something. We don’t like to be belittled. We don’t want people we respect to think we are crazy. Christians in every age have had to deal with this to one extent or another. Are you faithful enough to be thought crazy by someone?