Lessons in Truth: A Course of Twelve Lessons in Practical Christianity by H. Emilie Cady is a foundational text of New Thought spirituality that presents Christian metaphysics in a clear, practical, and accessible form. Structured as twelve concise lessons, the book is designed not merely for reading, but for inner transformation through understanding spiritual law. Cady emphasizes that Truth is unchanging and universal, and that spiritual knowledge, when rightly understood, has direct effects on everyday life.The core teaching of the book is that God is infinite Mind, ever-present good, and that human beings experience life according to their states of consciousness. Illness, lack, and fear are not ultimate realities but conditions arising from mistaken beliefs. Through affirmations, mental discipline, and right thinking aligned with divine law, individuals can overcome these limitations. Cady consistently stresses personal responsibility for thought and belief, while maintaining a compassionate and deeply Christian tone rooted in the teachings of Jesus.Lessons in Truth is especially valued for its simplicity and practicality. Rather than abstract theology, it offers tools for healing, spiritual growth, and inner peace. Its influence extends beyond its historical context, continuing to serve as a guide for readers seeking a spiritual approach to life, health, and personal transformation grounded in practical Christianity.