||From the very beginning of his career Berkeley was deeply concerned with the nature of signification and the role of signs in human thought, knowledge, and language. These concerns seem to be motivated primarily by concerns about religious mysteries, although they have much broader application. A 'mystery,' in the relevant sense, is a sentence to which religious believers assent 'by faith' which involves terms that do not stand for ideas possessed by those believers. In trying to explain how one can be said to believe what is asserted by a sentence without having an idea corresponding to each of the terms in that sentence, Similar problems are also raised by Berkeley's critique of abstraction: if there is no abstract, general idea triangle then there is no one idea which is the meaning of the word 'triangle'. These puzzles and concerns led Berkeley to rethink the ideational theory of meaning he had inherited from his predecessors. How far Berkeley goes in departing from that theory is a matter of considerable scholarly dispute.