In Three Dialogues between Hylas and Philonous, Berkeley sets up a Socratic dialogue between his own idealist views, in the person of Philonous (“lover of mind”), and the more Lockean views of Hylas (“matter”). Philonous argues that, while it is common sense to assume that the objects you perceive are real, it is against common sense to assume that those objects exist independent of perception. Through Philonous, Berkeley puts forward his “master argument.” The argument is essentially that it is impossible truly to conceive of an object outside of the mind because in the very act of trying to conceive of that object it is in the mind.
Berkeley also puts forward his theory that God is the perceptive mind that is always present and, therefore, is the mind that gives sensible qualities to objects. God groups various perceptions together. For example, humans experience the perception “touching water” and “feeling wet” at the same time. These patterns of perception are the subject of scientific study and described as laws of nature. However, they are not qualities which are inherent to an abstract material object. They are only assigned to objects by the mind of God.
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