Full Idea
Adam, though his rational faculties be supposed, at the very first, entirely perfect, could not have inferred from the fluidity and transparency of water, that it would suffocate him, or from the light and warmth of fire that it would consume him.
Gist of Idea
How could Adam predict he would drown in water or burn in fire?
Source
David Hume (Enquiry Conc Human Understanding [1748], IV.I.23)
Book Reference
Hume,David: 'Enquiries Conc. Human Understanding, Morals', ed/tr. Selby-Bigge/Nidditch [OUP 1975], p.27