Two factors, more specifically, two intellectuals—epitomize this era: Sir Isaac Newton (1642-1727) and John Locke (1632-1704). Newton, an English mathematician and astronomer, made revolutionary scientific discoveries concerning light and gravitation and formulated the basis of modern calculus. His genius changed humankind’s view of itself and its capabilities, showing that individuals can practically, rationally, and reasonably order their world for the benefit of all human beings. English philosopher Locke formulated these attitudes into his Essay Concerning Human Understanding (1689). Locke’s basic thesis asserts that humans are born devoid of any preformed ideas or perceptions; in essence, a person is a tabula rasa, or “blank slate.” Through experience, as perceived through the senses, people develop knowledge.
This theory, revised and amended by numerous philosophers of the century, casts doubt upon the previously accepted role of a divine being in the lives of humans. With the Christian idea of predestination called into question, a new attitude toward the Creator was developed to coincide with these new philosophical concepts. This “religion,” termed Deism, espoused a belief in a “clockwork universe,” in which the Creator provided the spark to create the world but then took an inactive role in its operation. Thus, people, through reason (not through a reliance on revelation), had the responsibility to arrange their own affairs, both personally and socially. Many American colonists adhered to this philosophy, most notably Thomas Jefferson, the radical revolutionary Thomas Paine, and Franklin.