There are two aspects of God: God himself, who in the end is unknowable, and the revealed aspect of God, which created the universe, preserves the universe, and interacts with mankind in a personal way. In Judaism, the principle statement of monotheism is the Shema, a passage in the Torah which states, "Listen, Israel, HaShem is our God HaShem is one." Maimonides stated in his 13 principles of faith that God is the Creator and Guide of everything that has been created, that he is one, there is no unity in any manner like his, and he alone is God; that he is free from all the properties of matter and that there can be no (physical) comparison to him whatsoever; that he is eternal, and is the first and the last; that he knows all the deeds of human beings and all their thoughts; that he rewards those who keep his commandments and punishes those that transgress them; and that at a time when it pleases God, he will revive the dead.