How did William James connect thought and knowledge to human survival?

William James, a key figure in pragmatism and functionalism, viewed the mind as a purposive, adaptive tool shaped by evolutionary influences. Influenced by Charles Darwin, James argued that the primary function of thought is to help individuals establish "satisfactory relations with our surroundings," thereby facilitating survival and practical success.123

In this framework, James maintained that thought is not merely a passive reflection of reality but an active, adaptive process. He believed that the value of an idea or belief is determined by its utility—its ability to expedite action and help people navigate their environment. Consequently, he defined truth functionally: an idea is true if it "works" by opening up valuable directions for thought and action. By choosing means to attain future ends, individuals use their mental faculties to mold their reality according to their needs and desires, making knowledge a vital instrument for human flourishing and survival.1