Hannah Tatum Whitall Smith (February 7, 1832 - May 1, 1911) was a lay speaker and author in the Holiness movement in the United States and the Higher Life movement in the United Kingdom of Great Britain and Ireland. She was also active in the Women’s Suffrage movement and the Temperance movement. She is best known for her classic, The Christian's Secret of a Happy Life, first published in 1875. This perennially popular book has been effective for many as an introduction to the realm of the growth truths--although not from a clear doctrinal standpoint. Another book, The God of All Comfort, has been very helpful to many undergoing trial, etc.