 Crusius also rejected the Principle of Sufficient Reason and the Ontological Argument in terms that are very close to what we find in Kant’s writings of this period. Philosophers of this school developed a far more robust account of rational faith than is found in the writings of Wolff. Thus, in a way reminiscent of the later Kant, Crusius argues that we are necessitated to believe something if its denial would undermine or render impossible the pursuit of an end towards which we have a duty (Crusius 1751: §339), the most important of which is our obligation to God (Crusius 1751: §345). This obligation, according to Crusius, necessitates, among other things, a belief in freedom, immortality and even in the reliability of reason itself (see Chance 2019).