The Will to Believe, and Other Essays in Popular Philosophy Quotes
by William James

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William James made it his life's work to argue the legitimacy of belief (or faith) without evidence to support a claim. The Will to Believe was a lecture given by James in 1896. This lecture mostly pertains to religious belief but can apply to a broader scope, too, as you will see later. The thesis of The Will to Believe is found in the brief section IV and reads as follows:

Our passional nature not only lawfully may, but must, decide an option between propositions, whenever it is a genuine option that cannot by its nature be decided on intellectual grounds; for to say under such circumstances, "Do not decide, but leave the question open," is itself a passional decision—just like deciding yes or no—and is attended with the same risk of losing truth.

Let's unpack this thesis statement. What does James mean by "passional nature"? Passional in this sense is not meant in a romantic or biblical way (i.e., the passion, or suffering, of Christ). Passional means emotional here. Where the objective of thought is Truth (with a capital T), it is generally held that humans investigate Truth in one of two ways: via logic/reason or emotion/intuition. James is arguing that the emotional way is just as valid as the logical in pursuit of Truth. Whatever "cannot [...] be decided on intellectual grounds" must be decided via the passional nature. Trust your intuition, James might have said. As you can imagine, this is a fiercely criticized doctrine in an era and discipline where reason was foundational and, in some cases, penultimate.

It is important to couch James's "belief as valid" doctrine in the nineteenth century. The 1800s brought Darwin's theory of evolution, and empiricism—or employing only measurable evidence—was the dominant way of looking at the world. Science became the new God of the nineteenth century. Philosophers like Immanuel Kant and Jean-Jacques Rousseau were reacting to the eighteenth century's Romanticism, which is probably where James's The Will To Believe would have fit more readily and been much more welcomed.

In support of his thesis, James gives examples of "self-fulfilling beliefs" in section IX. He writes:

Do you like me or not?—for example. Whether you do or not depends, in countless instances, on whether I meet you half-way, am willing to assume...

(The entire section is 597 words.)