"William Penn remains one of early Quakerism’s most vibrant thinkers. He not only applied Quaker principles to the tricky business of statecraft but synthesized the charismatic spirituality of the early 1640s with the intellectual impulses of the Restoration’s cultural elite. Among the most influential ingredients of this fusion was the ancient Greek philosophy of Stoicism. Rooted in the rich intellectual melting-pot of 4th century Athens, the Stoic School taught that the path to greatest happiness involved a life of contemplation, simplicity, and sobriety. At the heart of these commitments was a firm belief that deep within each person there subsisted a divine spark of Reason which connected each creature to a Supreme Being."
-- William Penn Among the Stoics, The Armchair Theologian