More than 1,800 years ago, the last of Rome’s “Five Good Emperors,” Marcus Aurelius Antoninus, wrote, “Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.” His advice is still sound, though soon after his reign the Roman Empire began the long process of dissolution that culminated in its overthrow 300 years later.Arming ourselves with the “weapons of reason” is necessary but insufficient.