When freemasonry entered the 18th century, a new layer of ideas was added. The brotherhood associated itself and was associated with science in general and with the new culture of Newtonian experimental science in particular. ‘Enlightenment foundations’ explains that during the first phase of its modern existence, there was considerable overlap between scientific culture and freemasonry. Freemasonry is saturated with key Enlightenment concepts such as progress, perfectibility, and cosmopolitanism. The 1723 The Constitutions of the Freemasons is discussed along with the continued requirement for secrecy as well as how philanthropy, charity, and cosmopolitanism are also major elements of masonic thought.