How a 16th-century humanist weaponized ancient philosophy to survive civil war

Art · Published 18 October 2026 Swipe more like this →

In short: In the blood-soaked landscape of the Eighty Years' War, a Flemish humanist sought a way to endure. He didn't just look to the Bible; he looked back to the Roman Stoics. By weaving together pagan endurance and Christian faith, he created Neostoicism—a philosophy of

Neostoicism emerged in the late 16th century, primarily through the work of Flemish humanist Justus Lipsius (1547–1606). It sought to synthesize Stoic ethics with Christian beliefs, a project that modern scholars often view as a religious syncretism rather than a perfect synthesis. While John Calvin referenced 'new stoic' ideas earlier in the century, the specific movement of Neostoicism was distinct from his earlier thoughts.

Lipsius developed his core theories during his time in the Northern Netherlands (1578–1591) amidst the chaos of the Eighty Years' War. In his seminal work, De constantia (1583), he used a dialogue between himself and a fictional character to explore how individuals could endure public and private hardships. Unlike the original Stoics, who were often associated with materialism and determinism, Lipsius deliberately rejected these elements to make the philosophy compatible with Christian doctrine. He argued that while fate (fortuna) exists, it is a byproduct of divine providence, allowing for the existence of free will.

The movement was not a monolith. It branched into two main strains: one advocating for an active life in the world, and another favoring retreat and isolation. Politically, Neostoicism was often used to justify authoritarian order and the use of force to maintain stability. Some scholars, like Jonathan Israel, suggest Lipsius used these ideas to urge Netherlanders to reject confessional zealotry in favor of peaceful order. Others argue that the movement was a 'crisis philosophy' that never truly gained a profound hold on the general conscience beyond a few scattered individuals.

Despite its varying interpretations, Neostoicism had a massive cultural footprint. It influenced major figures across Europe, including Francis Bacon in England, Montesquieu in France, and various authors in Spain. It provided a framework for 'constancy'—the calm acceptance of the inevitable—by teaching that material pleasures and sufferings are irrelevant to the soul. By framing the control of passions as a matter of correct reasoning, Neostoicism offered a secular ethics that could function independently of specific religious requirements.

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