 As in his essay on Spencer, James explores the relations between temperaments and philosophical theorizing. Idealism, he holds, “will be chosen by a man of one emotional constitution, materialism by another.” Idealism offers a sense of intimacy with the universe, the feeling that ultimately I “am all.” But materialists find in idealism “a narrow, close, sick-room air,” and prefer to conceive of an uncertain, dangerous and wild universe that has “no respect for our ego.” Let “the tides flow,” the materialist thinks, “even though they flow over us” (WB 76). James is sympathetic both to the idea that the universe is something we can be intimate with and to the idea that it is wild and unpredictable. If he criticizes idealism for its “sick-room air,” he criticizes reductive forms of materialism for denying to “our most intimate powers…all relevancy in universal affairs” (WB 71). The intimacy and the wildness portrayed in these contrasting philosophies answer to propensities, passions, and powers in human beings, and the “strife” of these two forms of “mental temper,” James predicts, will always be seen in philosophy (WB 76). Certainly it is always seen in the philosophy of William James. 