God. It's such a small word to stand for such an immense mystery. Great theologians and ordinary folks have wrestled with it and lost. But this is just as it should be, according to Irma Zaleski. Any answer to the question "Who is God?" that satisfies our minds will likely be a false one, an idea about a reality that transcends ideas. Yet there is great value in asking the question, she says, because the answer to it is found in the asking: It is in the place of not-knowing that arises from asking "Who is God?" that words and concepts fall away, that the mystery of what that little...