The is the source of the link between the Cube of Space and the Hebrew letters. The ' itself does not directly mention a "cube of space", nor any kind of cube. Case based the Cube of Space upon two verses in the : the first, in chapter 4, associates six Hebrew letters with six cardinal directions (up, down, east, west, north, south); the second, in chapter 5, associates 12 Hebrew letters with 12 diagonal directional arms or boundaries (different translations use different terms), which Case interpreted as the 12 edges of a cube.