Isis Unveiled, a master-key to the mysteries of ancient and modern science and theology, published in 1877, was Helena Petrovna Blavatsky's first major book.

The book discusses or quotes, among others, Plato, Plotinus, the Chaldean Oracles, the Egyptian Book of the Dead, the Bible, Pythagoras, Ammonius Saccas, Porphyry, Iamblichus, Proclus, Apollonius of Tyana, the Popol Vuh, Paracelsus, Louis Jacolliot, Eliphas Levi, Marco Polo, Max Muller, Buddhist, Brahmanical, Chinese, Persian, Babylonian, Chaldean, Syrian, Gnostic and Egyptian literature and many more.

Quotations

"But in spite of these perhaps too great admissions, I maintain that Isis Unveiled contains a mass of original and never hitherto divulged information on occult subjects. That this is so, is proved by the fact that the work has been fully appreciated by all those who have been intelligent enough to discern the kernel, and pay little attention to the shell, to give the preference to the idea and not to the form, regardless of its minor shortcomings. Prepared to take upon myself -- vicariously as I will show -- the sins of all the external, purely literary defects of the work, I defend the ideas and teachings in it, with no fear of being charged with conceit, since neither ideas nor teaching are mine, as I have always

Isis entschleiert Ísis Sem Véu