Jacobi's "Über die Lehre des Spinozas" (1st ed. 1785, 2nd ed. 1789) expressed his strenuous objection to a dogmatic system in philosophy, and drew upon him the enmity of the Berlin group, led by Mendelssohn. Jacobi claimed that Spinoza's doctrine was pure materialism, because all Nature and God are said to be nothing but extended substance. This, for Jacobi, was the result of Enlightenment rationalism and it would finally end in absolute atheism. Mendelssohn disagreed with Jacobi, saying that pantheism shares more characteristics of theism than of atheism. The entire issue became a major intellectual and religious concern for European civilization at the time.