First published in 1926, *The Secret of the Ages* is a foundational text of the New Thought movement—a bold, poetic call to awaken the latent power of the mind. In this complete, unabridged edition, Robert Collier argues that the universe is governed by a single, universal law: that thought shapes reality. Drawing on scripture, philosophy, and early psychology, he offers a practical system for harnessing this law to achieve health, wealth, and purpose. This edition includes a new introduction and reader's notes that provide historical context and clarify Collier's ideas for the modern reader. Whether you are a student of the Law of Attraction, a seeker of inner transformation, or a curious reader of classic success literature, this volume presents the original text exactly as it first appeared—with all its period charm and provocative insight. Part of The Classic Success Library.