„Beside the external Existence of the Objects of Perception, another great Source of Errors and Difficulties, with regard to Ideal Knowlege, is the Doctrine of Abstract Ideas„. (§ 97) #Berkeley #AbstractIdeas
Berkeley, George, A Treatise Concerning the Principles of Human Knowlege: Part I. Wherein the Chief Causes of Error and Difficulty in the Sciences, with the Grounds of Scepticism, Atheism, and Irreligion, are Inquir’d Into. Dublin 1710.