  To the ‘single-case’ objection often credited to Hume, that the design argument is not cogent since this is the only universe of which we are aware, Reid replies that the objection “is build on the supposition, that our inferring design from the strongest marks of it, is entirely owing to our past experience of having always found these two things conjoined” (EIP 6.6, 511). But if Hume's criticism does pose a problem for the design inference, it also undermines our belief in other minds. This is because Reid also does not witness the intelligence of another person bringing about some effect (EIP 6.6, 511).