As a Man Thinketh is James Allen's enduring meditation on thought, character, conduct, and the inward discipline by which a life is shaped. First published in 1903, this brief but influential work argues that thought is not an idle private activity, but the seedbed of action, habit, circumstance, and moral character. Allen's title echoes the biblical phrase "As a man thinketh in his heart, so is he," yet the book's appeal has always reached beyond any single religious frame, placing it within the broader tradition of practical philosophy, moral reflection, and early twentieth-century inspirational literature. Written with unusual economy and seriousness, As a Man Thinketh sets out a disciplined view of self-command: a person's habitual thoughts form character, character guides action, and action gradually alters the conditions of life. Its continuing importance lies in that clarity. Before modern self-help became a commercial category, Allen expressed one of its central ideas in spare, memorable prose: that inward order, patient effort, and moral responsibility are inseparable from outward conduct. This Wilder Publications edition presents the work as a classic text of thought, character, and self-mastery, suitable for readers of philosophical essays, inspirational classics, personal discipline, and the literature of the inner life.