How did William James describe the practical function of thought?

William James described the function of thought as adaptive and purposive, viewing it as an instrument used by individuals to establish "satisfactory relations with our surroundings". Influenced by Charles Darwin, James argued that the primary role of thought is to expedite action, helping people navigate their environment and pursue future ends.12

In his pragmatic methodology, James maintained that the meaning of an idea is defined by its specific function and the difference it makes in human experience. He famously characterized this functional view of truth by stating that "the true is the name of whatever proves itself to be good in the way of belief". For James, the "working" of an idea—and thus its truth—lies in its ability to open up valuable directions for thought and action. Ultimately, he interpreted thought as a form of purposive behavior, where individuals use beliefs to mold reality according to their practical needs, interests, and "should-bes".13