Will to Believe Doctrine
Main article: The Will to Believe
In William James's lecture of 1897 titled "The Will to Believe," James defends the right to violate the principle of evidentialism in order to justify hypothesis venturing. Although this doctrine is often seen as a way for William James to justify religious beliefs, his philosophy of pragmatism allows him to use the results of his hypothetical venturing as evidence to support the hypothesis' truth. Therefore, this doctrine allows one to assume belief in God and prove its existence by what the belief brings to one's life.

Philosophy of religion
James did important work in philosophy of religion. In his Gifford Lectures at the University of Edinburgh he provided a wide-ranging account of The Varieties of Religious Experience (1902) and interpreted them according to his pragmatic leanings. Some of the important claims he makes in this regard:

Religious genius (experience) should be the primary topic in the study of religion, rather than religious institutions—since institutions are merely the social descendant of genius.
The intense, even pathological varieties of experience (religious or otherwise) should be sought by psychologists, because they represent the closest thing to a microscope of the mind—that is, they show us in drastically enlarged form the normal processes of things.
In order to usefully interpret the realm of common, shared experience and history, we must each make certain "over-beliefs" in things which, while they cannot be proven on the basis of experience, help us to live fuller and better lives.
The investigation of mystical experience was constant throughout the life of James, leading him to experiment with chloral hydrate (1870), amyl nitrite (1875), nitrous oxide (1882), and even peyote (1896). James claimed that it was only when he was under the influence of nitrous oxide that he was able to understand Hegel.[19] He concluded that while the revelations of the mystic hold true, they hold true only for the mystic; for others, they are certainly ideas to be considered, but can hold no claim to truth without personal experience of such.

Theory of emotion
James is one of the two namesakes of the James-Lange theory of emotion, which he formulated independently of Carl Lange in the 1880s. The theory holds that emotion is the mind's perception of physiological conditions that result from some stimulus. In James's oft-cited example; it is not that we see a bear, fear it, and run. We see a bear and run, consequently we fear the bear. Our mind's perception of the higher adrenaline level, heartbeat, etc., is the emotion.

This way of thinking about emotion has great consequences for the philosophy of aesthetics. Here is a passage from his great work, Principles of Psychology, that spells out those consequences.

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