Rubenstein takes the idea of a "pluralist pantheism" from this book, even as, she argues, James isn't ultimately willing to go there. She's right but no matter. James of all people would expect others to see farther, and the vista is splendid. I'll doubtless have occasion to dwell on some of James' pluralist thoughts, with which I resonate deeply. But here's a gem, from the book's last pages, which ties together all his thinking about religion going back to "The Will to Believe." What he calls the "Ladder of Faith" is the way, he proposes, that anyone arrives at believing anything - and why it matters that we do.
It might be true somewhere, you say, for it is not self-contradictory.
It may be true, you continue, even here and now.
It is fit to be true, it would be well if it were true, it ought to be true, you presently feel.
It must be true, something persuasive in you whispers next; and then—as a final result—
It shall be held for true, you decide; it shall be as if true, for you.
And your acting thus may in certain special cases be a means of
making it securely true in the end.
James, William. A Pluralistic Universe: Hibbert Lectures at Manchester College on the Present Situation in Philosophy [London: Longman, Green, 1909], 328-29