The Neoplatonists, the Gnostics, and the kabbalists are generally considered types of theosophists. Jakob Boehme, regarded as the father of modern theosophy, developed a complete theosophical system attempting to reconcile the existence of an all-powerful and all-good God with the presence of evil in the world. The philosophy and theology of Asia, especially of India, contain a vast body of theosophical doctrine. Modern theosophy draws much of its vocabulary from Indian sources. The Theosophical Society, with which theosophy is now generally identified, was founded in 1875 by Helena Petrovna Blavatsky; associated with her were H. S. Olcott and W. Q. Judge. Blavatsky wrote The Secret Doctrine (1888, repr. 1964) and Key to Theosophy (1931, rev. ed. 1969). An active exponent of theosophy in Europe, America, and the East was Annie Besant, who added many works to the literature on the subject.