professor at German Reformed Seminary, he described the Reformation as "the legitimate offspring, the greatest act of the Catholic Church". In addition, the Protestant slogan Semper reformanda implies a form of ongoing doctrinal development. Eastern Orthodoxy Eastern Orthodox theologians reject the concept of doctrinal development outright, instead arguing that the entire deposit of faith has been present in the Church from the very beginning, and has never changed. However, authors such as Daniel Lattier have argued that some older Eastern Orthodox thinkers did not reject the concept outright, and that Eastern Orthodoxy may allow a form of doctrinal development, albeit more limited than Western forms of it. See also Thomas Bayes Bayes' theorem Bayesian probability Grammar of Assent Probabiliorism Notes References John Henry Newman. An Essay on the Development of Christian Doctrine. (1845, revised 1878). Catholic theology and doctrine