The other difficulty to which I have referred, that of interpretation of symbols when forming the substance of the vision, may be dealt with somewhat more fully. Symbolism is a universal language and revelation most frequently is conveyed by means of it. As a preliminary to the study of symbolism the student should read Swedenborg's _Hieroglyphical Key to Natural and Spiritual Mysteries_, one of the earliest of his works and in a great measure the foundation of his thought and teaching. The Golden Book of Hermes containing the twenty-two Tarots is open to a universal interpretation as may be seen from the works of the Kabalists, and in regard to their individual application may be regarded in a fourfold light, having reference to the spiritual, rational, psychic and physical planes of existence. It is by means of symbols that the spiritual intelligences signal themselves to our minds, and the most exalted vision is, as an expression of intelligence, only intelligible by reason of its symbolism. Something more may be said in regard to the interpretation of symbols which may possibly be of use to those who have made no special study of the subject, and this may conveniently form the material of another chapter. CHAPTER VII. SYMBOLISM Symbols formed the primitive language of the human race, they spoke and wrote in symbols. The hieroglyphic writings of the aborigines of Central America, of the ancient Peruvians, of the Mongolians, and of the ancient Copts and Hebrews all point to the universal use of the ideograph for the purpose of recording and conveying ideas. If we study the alphabets of the various peoples, we shall find in them clear indications of the physical and social conditions under which they evolved. Thus the Hebrew alphabet carries with it unmistakable evidence of the nomadic and simple life of those "dwellers in tents." The forms of the letters are derived from the shapes of the constellations, of which twelve are zodiacal, six northern and six southern. This implies a superficial intimacy with the heavens such as would result from a life spent in hot countries with little or no superstructure to shut out the view. The wise among them would sit beneath the stars in the cool night air and figure out the language of the heavens.