Ralph Waldo Trine's In Tune with the Infinite presents a foundational statement of early twentieth-century New Thought philosophy, examining the relationship between mind, character, and the conditions of daily life. In this work, Trine explores the principle that inner alignment-of thought, intention, and conduct-shapes outward experience. Drawing on a synthesis of spiritual philosophy, ethical reflection, and practical observation, he argues that harmony with what he terms the "Infinite" produces clarity of purpose, steadiness of mind, and constructive action. The text addresses themes of self-mastery, mental discipline, moral responsibility, and the quiet cultivation of confidence and composure. Written in a measured and accessible style, In Tune with the Infinite reflects the broader intellectual current of New Thought, emphasizing the formative power of thought while maintaining a restrained, ethical framework. Its influence extended well beyond its initial publication, contributing to later developments in personal philosophy, spiritual writing, and the literature of self-directed improvement. This edition presents the text in a clear and carefully typeset form, preserving the original structure while supporting sustained reading.