Man and His Symbols

Such things are not symbols. They are signs, and they do no more than denote the objects to which they are attached. (Location 173)

Because there are innumerable things beyond the range of human understanding, we constantly use symbolic terms to represent concepts that we cannot define or fully comprehend. This is one reason why all religions employ symbolic language or images. But this conscious use of symbols is only one aspect of a psychological fact of great importance: Man also produces symbols unconsciously and spontaneously, in the form of dreams. (Location 187)