“Belief in God includes from the start, beginning with the Ten Commandments, two components that everyone finds difficult to grasp and to identify with.
The first is the perception of God as the One and Only, who is therefore all-embracing and all-supreme, divine, above all comprehension, and therefore far above any personal relationship to something defined and specific.
To this is compounded another difficulty, which is a faith that is entirely an abstraction, which does not allow any image, form, or other experience that can be grasped.”
–Rabbi Adin Steinsaltz
From We Jews, pp. 134–35, by Rabbi Adin Steinsaltz