"[We] can only know ourselves by knowing how we resemble and how we differ from others. Acquaintance [familiarity] with the human past is the only way to such self knowledge. . . .
In [studying history], eternal and unchanging truth does not emerge. Only inspired, informed guesses about what mattered and how things changed through time. . . . Not very good, perhaps; simply the best we have in the unending effort to understand ourselves and others . . ."
—Excerpt from "Why Study History?" by William H. McNeil
According to McNeill, what do people gain from the study of history?