The Life of the Spirit attempts to deal only with inner religion. In the Spirit we can all become one, although on the surface we may not be able to agree at all. The Kingdom of the Spirit is eternal and unchanging. Theology and doctrine change from age to age, but the inner Spiritual Reality is the same always. "Mr. Hamblin has through much experience attained to this deeper knowledge of the Infinite Love and a rare insight into the Soul's deepest needs. "How good it is to listen again to the sublime words: "Learn of Me for I am meek and lowly." We cannot change the heart by any amount of thinking, but, if we have made the sacrifice the offering of our Whole being to the Christ, the thoughts of the heart (which is the Place of Wisdom) flood the mind with purity and strength." Henry Thomas Hamblin was an English mystic and New Thought author. He believed that "abounding health, sufficiency of supply, achievement, accomplishment and joy indescribable are the normal state for man.", and that, to achieve this state, man needed to come into "harmony with Cosmic Law".