Though wherever the mind perceives the agreement or disagreement of any of its ideas, there be certain knowledge; yet it does not always happen, that the mind sees that agreement or disagreement, which there is between them, even where it is discoverable; and in that case remains in ignorance, and at most gets no further than a probable conjecture.
Gogamenak bere ideietako batzuen arteko adostasuna edo desadostasuna hautematen duen guztian ezagutza ziurra erdiesten badu ere, ez da beti gertatzen gogamenak haien artean dagoen adostasun edo desadostasun hori aurkitzea, aurkigarria izan arren, eta kasu horretan ezjakin geratzen da edota gehienik ere aieru gertagarri ("probable") batera iristen da.