"When commerce with Moslems flourished, zeal for their massacre declined."

“The Hundred Years' War, like the crises of the Church in the same period, broke apart medieval unity.”

“The ills and disorders of the 14th century could not be without consequence. Times were to grow worse over the next fifty-odd years until at some imperceptible moment, by the some mysterious chemistry, energies were refreshed, ideas broke out of the mold of the Middle Ages into new realms, and humanity found itself redirected.”

“If it is not profitable for the common good that authority should be retained, it ought to be relinquished.”

“To put on the garment of legitimacy is the first aim of every coup.”

“Survivors of the plague, finding themselves neither destroyed nor improved, could discover no Divine purpose in the pain they had suffered. God’s purposes were usually mysterious, but this scourge had been too terrible to be accepted without questioning. If a disaster of such magnitude, the most lethal ever known, was a mere wanton act of God or perhaps not God’s work at all, then the absolutes of a fixed order were loosed from their moorings. Minds that opened to admit these questions could never again be shut. Once people envisioned the possibility of change in a fixed order, the end of an age of submission came in sight; the turn to individual conscience lay ahead. To that extent the Black Death may have been the unrecognized beginning of modern man.”

“Economic man and sensual man are not suppressible.”