As, for example, this symbolic reference of the corner-stone of a material edifice to a mason, when, at his first initiation, he commences the intellectual task of erecting a spiritual temple in his heart, is beautifully sustained in the allusions to all the various parts and qualities which are to be found in a "well-formed, true and trusty" corner-stone.[110] Its form and substance are both seized by the comprehensive grasp of the symbolic science. Let us trace this symbolism in its minute details. And, first, as to the form of the corner-stone. The corner-stone of an edifice must be perfectly square on its surfaces, lest, by a violation of this true geometric figure, the walls to be erected upon it should deviate from the required line of perpendicularity which can alone give strength and proportion to the building. Perfectly square on its surfaces, it is, in its form and solid contents, a cube. Now, the square and the cube are both important and significant symbols. The square is an emblem of morality, or the strict performance of every duty.[111] Among the Greeks, who were a highly poetical and imaginative people, the square was deemed a figure of perfection, and the ἀνὴρ τετράγωνος--"the square or cubical man," as the words may be translated--was a term used to designate a man of unsullied integrity. Hence one of their most eminent metaphysicians[112] has said that "he who valiantly sustains the shocks of adverse fortune, demeaning himself uprightly, is truly good and of a square posture, without reproof; and he who would assume such a square posture should often subject himself to the perfectly square test of justice and integrity." The cube, in the language of symbolism, denotes truth.[113] Among the pagan mythologists, Mercury, or Hermes, was always represented by a cubical stone, because he was the type of truth,[114] and the same form was adopted by the Israelites in the construction of the tabernacle, which was to be the dwelling-place of divine truth. And, then, as to its material: This, too, is an essential element of all symbolism. Constructed of a material finer and more polished than that which constitutes the remainder of the edifice, often carved with appropriate devices and fitted for its distinguished purpose by the utmost skill of the sculptor's art, it becomes the symbol of that beauty of holiness with which the Hebrew Psalmist has said that we are to worship Jehovah.[115] The ceremony, then, of the north-east corner of the lodge, since it derives all its typical value from this symbolism of the corner-stone, was undoubtedly intended to portray, in this consecrated language, the necessity of integrity and stability of conduct, of truthfulness and uprightness of character, and of purity and holiness of life, which, just at that time and in that place, the candidate is most impressively charged to maintain.