History is a guide to navigation in perilous times. History is who we are and why we are the way we are.

McCullough frames history not as inert record-keeping but as practical wisdom: a “guide to navigation” when societies face uncertainty, conflict, or rapid change. The metaphor suggests that the past offers bearings—patterns of human behavior, institutional strengths and failures, and hard-won lessons—that can inform present decisions without pretending to provide mechanical answers. His second sentence shifts from utility to identity: history is the accumulated story that shapes collective character, values, and assumptions. Together, the lines argue that historical understanding is both civic equipment and self-knowledge, essential for responsible citizenship and for resisting amnesia, mythmaking, or simplistic narratives about who “we” are.