There is no single Jewish conception of God. God has been described, defined, and depicted in a variety of ways in different works of Jewish literature and at different historical moments.
God is beyond human comprehension, but that has not stopped Jewish thinkers from attempting to describe God. The Jewish God is referred to with many names and euphemisms, though God's scriptural names are traditionally only pronounced during religious activities. Belief in one God is one of Judaism's defining characteristics. Nonetheless, some parts of the Torah seem less monotheistic than others. In addition, there are minor currents of thought within Judaism that play down the importance of belief in God.
The God of the Bible has a multitude of roles and attributes that often contrast sharply with each other. In this sense, God is like a person--experiencing a range of emotions, often torn between competing allegiances and values. The God of the Bible communicates with people through prophets and is even open to critique. Of the varied biblical representations of God, the two that became particularly prominent in Jewish thought are God's oneness and God's role as creator of the world.
Classical rabbinic literature portrays God in a similar way. However, in rabbinic writings, God no longer communicates with people through prophecy, and God is no longer considered a direct legal authority. One of the most radical Jewish descriptions of God can be found in the heikhalot literature, an early corpus of mystical texts, which actually describes the physical dimensions of God. Though most early Jewish thinkers did not shy away from depicting God in human terms, Philo, a first-century philosopher, was an exception. He integrated Greek philosophy with Judaism and conceived of God in a more abstract way.