Sir Isaac Newton was born in 1642 in England. He is considered by some to be most brilliant man that ever lived. Other contenders are Mozart and Goethe. Newton is credited with developing calculus and discovering Laws of Gravitation and Laws of Motion (more correctly, "Three Laws of Motion underlying Classical Mechanics"). You probably learned in school at about same age as he discovered these laws that an apple fell on his head which got him thinking. As story goes, he wondered why apple fell and Moon didn't. His 23rd year was a phenomenon, an Annus Mirabilis. Later he also wrote Principia Mathematica in 1868-87 and Optics in 1704.

Young Newton was a real seeker. As a young person he wrote in his notebook, "Amicus Plato; amicus Aristoteles; magis amica veritas" which means "Plato is my friend, Aristotle is my friend, but truth is my best friend." Latin was language in which educated class in Europe communicated with one another.

Newton was recently in news because of his Bibles. Like most introverts, Newton read a lot and one of books he read a lot was Bible. He had at least thirty of them. I've been running a book survey on my website for introverts. One of questions I ask is whether people dog ear and write in their books. From results of my survey, most people wouldn't dream of it but Newton's answer would be "yes".

In a recent interview with Patricia L. Paddey of Bible Network News, Dr. Stephen Snobelen, assistant professor of history of science and technology at University of King's College in Halifax, said, "We actually have 30 of [Newton's] personal Bibles at Trinity College, Cambridge that can be examined…. His personal Bible that he used for looking up references is a very small, hand-held Bible. That is a remarkable artefact [sic] to handle physically, because you can actually see dog-eared pages. You can see soiling. You can see this physical testimony of a lifetime." Dr. Snobelen is one of only a handful of academics worldwide who now study [Newton's Bibles and other non scientific manuscripts] for insights into his theology. These papers were willed to Cambridge University by economist John Maynard Keynes in 1946.

Newton was an intense reader. "While it is possible that some dog-earing was work of subsequent owners," Snobelen continues, "it is evident from fact that most instances of it point quite precisely to passages of demonstrable importance to Newton that vast majority is his own. He used dog-ears not merely to mark pages but to align page corners with specific passages of interest (hence fact that pages may have their corners turned down, up, or both)."

According to London Daily Telegraph, Newton was consumed by apocalyptic research and reluctantly predicted that world would end in 2060. "Thousands of Newton's papers, which had lain in a trunk in house of Earl of Portsmouth for 250 years, were sold by Sotheby's in late 1930s. John Maynard Keynes ... bought many of texts on alchemy and theology. But much of material went to an eccentric collector, Abraham Yahuda, and was stored in Hebrew National Library. It was among these documents that date was found."

Sir Isaac Newton was an INTJ introvert. There are eight different types of introverts, according to Keirsey Personality Theory and Myers-Briggs Temperament Inventory, both based on Jungian approach to personality interpretation. Newton was an INTJ Introvert, called Mastermind. This is a rare one per cent of population according to estimates by Keirsey Temperament Theory.