Master Mind: The Key to Mental Power Development and Efficiency distills Atkinson's New Thought into a compact course on attention, will-training, habit, suggestion, and directed imagination. In crisp, didactic prose, it interleaves brief theory with graded exercises cultivating concentration, self-control, and mental economy. Framed by the Progressive Era's efficiency craze and popular psychology, it translates metaphysical "mind-power" into practical self-mastery, linking character formation to measurable results in work and conduct. William Walker Atkinson (1862-1932) was an attorney, publisher, and influential New Thought writer, prolific under his own name and as Theron Q. Dumont and Yogi Ramacharaka; he is often credited as a principal behind The Kybalion. By his own account, recovery from professional burnout led him to autosuggestion, occult psychology, and yogic discipline-an eclectic formation that shapes the book's blend of businesslike clarity with esoteric confidence in the mind's plasticity. Master Mind merits attention from scholars of self-help and from practitioners seeking disciplined mental training. Read it as both historical document and workbook: its concise drills in attention, habit, and will offer durable techniques, while its context illuminates how early twentieth-century metaphysics fed the modern culture of productivity and ethical self-governance. Quickie Classics summarizes timeless works with precision, preserving the author's voice and keeping the prose clear, fast, and readable-distilled, never diluted. Enriched Edition extras: Introduction · Synopsis · Historical Context · Brief Analysis · 4 Reflection Q&As · Editorial Footnotes.