 In light of the text of The History of England (VI, 542) quoted at the start of this sub-section, it is clear Hume thinks that Newton’s laws are not sufficient for explaining all of nature. So without (yet) taking a stance on how to interpret Hume’s treatment of induction or his account of causation, one can distinguish two further strands of Hume’s skepticism: i) Hume treats Newton as showing conclusively that the domain of possible knowledge will leave parts of nature unknown forever; ii) in particular, this will include the cause(s) behind our fundamental principles. The combination of (i–ii) entails that Newtonian natural theology—a very popular eighteenth century intellectual enterprise (see the  entry on natural theology and natural religion)—is  based on shaky foundations.