But philosophers advancing still in their inquiries, discover that, as we are totally ignorant of the power on which depends the mutual operation of bodies, we are no less ignorant of that power on which depends the operation of mind on body, or of body on mind; nor are we able, either from our senses or consciousness, to assign the ultimate principle in one case more than in the other.
Baina euren ikerketan aurrera diharduten filosofoek erreparatzen dute ezen, gorputzen elkar-ekintzan agintzen duen ahala erabat ezezagun zaigun bezala, ez zaigula gutxiago ezezagun gogoaren gorputzarekiko, edo gorputzaren gogoarekiko ekintzan agintzen duen ahala, eta ez dugula kasu batean baino bestean azken printzipioa hautemateko gaitasun gehiago, zentzuen edo kontzientziaren bitartez.