Having demonstrated that the Qabbalists divided the universe into four worlds, each consisting of ten spheres, it is necessary to consider next how the ten spheres of each world were arranged into what is called the "Sephirothic Tree." This Tree is composed of ten circles, representing the numbers 1 to 10 and connected together by twenty-two canals �the twenty-two letters of the Hebrew alphabet. The ten numbers plus the twenty-two letters result in the occult number 32, which, according to the Mishna, signifies the Thirty-two Paths of Wisdom. Letters and numbers, according to the Qabbalists, are the keys to all knowledge, for by a secret system of arranging them the mysteries of creation are revealed.