First, when any complex idea (for it is complex ideas that are most liable to confusion) is made up of too small a number of simple ideas, and such only as are common to other things, whereby the differences that make it deserve a different name, are left out.
Lehena, ideia konplexuren bat (ideia konplexuak dira, izan ere, nahasmendura joera handiena dutenak) ideia bakun gutxiegiz osaturik dagoenean eta ideiok beste gauza batzuekiko komunak direnean, ideia horri izen ezberdina ezartzeko merezimendua dakarkioten diferentziak kanpo uzten dira.