Full Idea
A miracle is a violation of the laws of nature, and as a firm and unalterable experience has established these laws, the proof against a miracle is as entire as any argument from experience can possible be imagined.
Gist of Idea
A miracle violates laws which have been established by continuous unchanging experience, so should be ignored
Source
David Hume (Enquiry Conc Human Understanding [1748], X.I.90)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.114