“Success or failure depends more upon attitude than upon capacity successful men act as though they have accomplished or are enjoying something. Soon it becomes a reality. Act, look, feel successful, conduct yourself accordingly, and you will be amazed at the positive results.”

American psychologist and philosopher, late 19th to early 20th century. He founded functional psychology and explored the interplay between mind and body, emphasizing practical experience and individual freedom. His work on pragmatism and religious belief remains influential in both academic and personal thought.