The modern-day marathon is based on the story of a Greek messenger, Pheidippides. According to legend, in 490 bc he ran approximately twenty-five miles (forty kilometers) from Marathon to Athens to announce the Greeks’ victory against their formidable foe, the invading Persians. Today, people run marathons for the personal satisfaction of an athletic achievement, but Pheidippides had a greater purpose behind his effort: each of his steps was run for the sheer joy of delivering such good news to his kinsmen!

Some 500 years later, two women also ran to deliver good news—the most pivotal news in all of history. When…