In judging of the understanding of animals, we must guard against ascribing to it the manifestations of instinct, a faculty which is quite distinct both from understanding and reason, but the action of which is often very analogous to the combined action of the two.
Hala ere, animalien adimena epaitzean, gorde egin behar ditugu geure buruak instintuaren kanporatzea dena haiei egoztetik, horretaz eta arrazoimenaz zeharo bestelako gaitasuna den hori, zeinak sarritan, ordea, horien bien ekintza bateratuaren oso era analogoan eragiten baitu.