Thankfully, the New Testament authors wrote out of personal devotion and zeal for Christ, who had transformed their lives. Their passion didn’t undermine their objectivity or twist the truth— no more so than did the passion of Auschwitz survivors Elie Wiesel or Viktor Frankl, who wrote with both fervor and penetrating insight about their experience and the human condition. Whether Holocaust survivors or New Testament witnesses, we’re drawn to their writings precisely because they couldn’t stop speaking about what they’d seen and heard. The charge of “bias” is often a truth-avoidance tactic, and the critic is still left holding his own bundle of arbitrary biases that needn’t be taken seriously. No, certain perspectives (“biases”)—even passionate ones—can be accurate, and we can many times recognize those that we should dismiss and others that we should affirm.
— Paul Copan, from Loving Wisdom, kindle location 49