“According to Pythagoreans, the cube is a symbol of both matter and man, the opening of the cube being a symbol of the unfoldment of man and the releasing of geometric mysteries within himself. To the Christian, Christ is the perfect man; therefore, he becomes the embodiment of the perfect measure of a man, the cube. In Freemasonry, the perfect ashlar or trued stone is the proper figure of the perfect man, for he is square, upright, and true, which are the moral qualities of a cube. The perfect cube represents the personality that has had all the uneveness, roughness, and inequality polished away by experience. Such a stone is ready to become a block in the Everlasting House not built by hands but eternal in the heavens." 

– Manly P. Hall