Abstract

Berkeley published the New Theory in 1709, the Principles in 1710, and Three Dialogues in 1713. These three books, while differing from one another in form and in content, nevertheless display considerable overlap with one another, covering much the same ground. There is no reason to regard the use Berkeley makes of idealism and claims based on idealism to be significantly different in the New Theory from the other works, and the conclusions he draws there are similar to those of the later works. The Principles certainly differs from the New Theory but is like Three Dialogues in explicitly endorsing an idealist ontology. Nevertheless, the Principles does differ from Three Dialogues in offering considerably less argumentation for this ontology. It can be surmised that Berkeley was acutely aware of the difficulties of convincing others of the truth of his theory, and was prepared to think and re‐think the best way of putting his arguments persuasively.