Aiden Wilson Tozer (1897 –1963) was an American Christian pastor, preacher, author, magazine editor, and spiritual mentor. 44 years of ministry, associated with the Christian and Missionary Alliance (C&MA), a Protestant Evangelical denomination. Among the more than 60 books that bear his name, at least two are regarded as Christian classics: The Pursuit of God and The Knowledge of the Holy. His books impress on the reader the possibility and necessity for a deeper relationship with God.
John Calvin (1509–1564) was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. John Calvin was Martin Luther's successor as the preeminent Protestant theologian. Calvin made a powerful impact on the fundamental doctrines of Protestantism, and is widely credited as the most important figure in the second generation of the Protestant Reformation.