Isaac Newton, besides being known as one of the greatest scientists of all time, had a life rich in diverse interests, encompassing not only science but also theology, alchemy, and finance. In his later years, he devoted himself intensely to religious and financial matters, reflecting a lesser-known, but equally fascinating, side of his life. This final part of his biography offers a profound insight into his personal beliefs and his attempts to reconcile science with faith and economics.
Newton's later years
After revolutionizing physics with his work "Philosophiæ Naturalis Principia Mathematica" and making important contributions in mathematics and optics, Newton moved to London in 1696. There he took up the position of Warden of the Royal Mint, where he worked to reform the English monetary system, combating counterfeiting and overseeing the introduction of new coins. His work at the Royal Mint not only gave him prestige and a well-paid position, but also allowed him to accumulate a considerable personal fortune.
In 1703, he was elected president of the Royal Society, a position he held until his death. During this time, Newton oversaw important scientific debates and maintained a strong control over academia. Despite his achievements in science and administration, in his later years, he devoted himself to writing on theology and alchemy, distancing himself from traditional scientific research.
Newton died on March 31, 1727 (Gregorian calendar, 11 days earlier Julian calendar) and was buried in Westminster Abbey with great honors. However, what he left behind after his death were not only his scientific contributions, but also thousands of pages of writings on religion, alchemy, and financial matters.

Newton and Religion: Theological Writings
Although Newton is famous for his achievements in science, he devoted a significant portion of his life to the study of the Bible and theology. His theological writings total over a million words, considerably more than his scientific texts. These works reflect a deep interest in the interpretation of Scripture and a critical view of the established doctrines of his time.
Newton was a devout Christian, but his beliefs did not completely align with orthodox Christianity. He rejected the doctrine of the Trinity, a fundamental belief in the Anglican Church and many other Christian denominations. Instead, he held a Unitarian: He believed in the existence of a single, omnipotent God, and viewed Jesus Christ as a divine being, but not equal to the Father in nature. This position, at the time, could have been considered heretical, which is why Newton kept his religious ideas secret throughout his life.
One of the main themes of his religious writings was the interpretation of the Apocalypse and biblical prophecies. Newton attempted to find precise dates for future events based on biblical chronology, believing that human history was governed by a divine plan. He was convinced that the hidden knowledge in the Scriptures could be deciphered and that the Bible held keys to understanding the future of humanity.

Alchemy
In addition to theology, Newton was fascinated by alchemy, a practice that at the time was not seen as a pseudoscience, but rather as a discipline that sought to understand the nature of matter and the secrets of transformation. Alchemy significantly influenced his scientific thinking, especially his view of physics and chemistry. For years, Newton devoted time to alchemical experimentation and writing extensively on the subject, in search of the "philosopher's stone," a legendary substance believed to be able to turn base metals into gold and grant immortality.
His writings on alchemy were closely guarded, and only after his death was the full extent of his interests in this area revealed. Newton saw alchemy not only as a means of transmuting metals, but also as a path to understanding the fundamental laws of the universe. Although many of his alchemical experiments yielded no tangible results, the search for these "hidden truths" influenced his scientific approach, leading him to explore the interactions of forces in nature.
Investments and finance in recent years
Despite his brilliance in mathematics and physics, Newton had a complicated relationship with the world of investment. As mentioned above, his involvement in the South Sea Company bubble of 1720 caused him significant financial losses. This episode made it clear that even a genius of his stature was not immune to making mistakes in the financial field. We talk about this event in more detail in the following note:
After the South Sea Bubble, Newton became much more cautious with his investments, preferring safer assets like government bonds. However, he remained a student of the economic and financial principles of his time, influenced in part by his work at the Royal Mint. During his years at the Royal Mint, Newton played an important role in reforming coinage in England, combating the problem of counterfeiting and establishing more rigorous standards for metal purity.
The lasting influence of his non-scientific writings
Although his writings on theology, alchemy, and finance did not achieve the same fame as his scientific works, they offer an invaluable window into Newton's mind and his attempts to understand the universe as a whole. His interdisciplinary approach led him to see science, religion and philosophy as interrelated aspects of human knowledge.
His theological works, though less well-known, influenced the way some later philosophers and theologians approached the relationship between science and faith. Newton's critical view of certain religious doctrines, his literal interpretation of biblical prophecies, and his meticulous focus on biblical chronology distinguish him from other thinkers of his time.
As for alchemy, although it is now seen as a pseudoscience, Newton's obsession with discovering the hidden principles of nature indirectly contributed to the development of modern chemistry. His experimentation with substances and his theories about matter reflect an effort to unravel the secrets of nature beyond what the scientific theories of his time could explain.
Conclusion
Isaac Newton is a classic example of how a brilliant mind can encompass multiple fields of knowledge, from the exact sciences to religious and esoteric studies. His later years were marked by a deep interest in theology and alchemy, complemented by a significant career in finance and monetary management. Although his fame endures primarily for his scientific contributions, his religious writings and his involvement in alchemy and finance demonstrate that he was a multifaceted man, whose interests extended far beyond mathematics and physics.
Newton's later years reflect a man who did not conform to the limits of accepted knowledge and who tirelessly sought to understand both the visible and the invisible. His legacy transcends science, encompassing theology, philosophy, and economics, reminding us that the search for truth can take many forms, and that genius can manifest itself in a variety of interests and disciplines.
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