GREATEST COMMON MEASURE

Late Dr. Lerone Bennett, Jr., asks in WHAT MANNER OF MAN? a book from 1964 on the life and work of Rev . Dr. Martin Luther King, Jr., that reprises Mark 4:41: "What manner of man is this, that even the wind and the sea obey him?" Dr. King himself has observed that, "The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." These two great men's thoughts are conflated and evoked in Euclid's ELEMENTS, book 7, proposition 2, "Porism"--"From this it is manifest that, if a number measure two numbers, it will also measure their greatness common measure." What then is the "greatest common measure of mankind?" I now ask?   https://mathcs.clarku.edu/~d…/elements/bookVII/propVII2.html