The book is a collection of essays and anecdotes that explore the existence and activities of demons and evil spirits. It draws heavily on biblical and historical sources, as well as on Sinclair's own observations and experiences.
George Sinclair (d. 1696) was a Scottish philosopher, mathematician, and author. He is best known for his book "Satan's Invisible World Discovered," which was published posthumously in 1685. The book is a collection of essays and anecdotes that explore the existence and activities of demons and evil spirits. It draws heavily on biblical and historical sources, as well as on Sinclair's own observations and experiences. Sinclair was a deeply religious man who believed in the reality of supernatural forces and their influence on human affairs. He argued that demons and evil spirits were responsible for many of the ills of the world, and that they could be defeated only through faith and prayer. Although "Satan's Invisible World Discovered" was widely read and influential in its time, it was also controversial. Some readers accused Sinclair of promoting superstition and irrationality, while others criticized his reliance on anecdotal evidence and his tendency to attribute natural phenomena to supernatural causes. Despite its flaws, the book remains a fascinating historical document and a valuable source of insight into the beliefs and fears of seventeenth-century Europe.