4. If it were the design of my present undertaking to inquire into the natural causes and manner of perception, I should offer this as a reason why a privative cause might, in some cases at least, produce a positive idea; viz.
4. Nire asmoa kausa naturalak eta hautemateko modua ikertzea izan balitz, gabeziazko kausa batek, kasu batzuetan bederen, zergatik sortaraz dezakeen ideia positibo bat azaltzeko arrazoi hauxe eskainiko nuke: