The resultant book, "Lessons in Truth" has become the defacto textbook of Unity as it explains the founding principles of the Movement. This book is a dynamic tool to assist each of us in our spiritual unfoldment.

Emilie Cady was one of the pioneers of New Thought. Her training as a homeopathic physician combined with her insights as a metaphysician, enabled her to treat patients medically and spiritually. Her approach was simple, clear and rooted in her own experience. Cady teaches that one's life can be transformed by the power of one's thoughts, words, and beliefs, encouraging us to find the truth as it is written in our hearts and then apply these truths in every area of one's life.

Cady was a student of Emma Curtis Hopkins, the renowned New Thought "teacher of teachers". A contemporary of popular New Thought writer Emmett Fox, as well as Ernest Holmes and many other New Thought Greats. Inspired by Biblical teachings and influenced by the ideas of Ralph Waldo Emerson, she partnered with Charles and Myrtle Fillmore, in the foundation of the Unity School of Christianity.

Since it's first publication in 1896, Unity's textbook Lessons in Truth by H. Emilie Cady has sold over 1.5 million copies. Over the years millions of people have read Lessons in Truth. Emilie Cady shared the belief of the Fillmore's and Albert Grier that "truth should be told not sold." Thus her books were placed in the public domain for all to discover the path to inner peace.