  Leibniz therefore sought to develop a different strategy in order to clear God of the charge of being the author of sin. In the Philosopher's Confession, his most significant treatise on evil aside from the Theodicy, Leibniz claims that although God wills everything in the world, his will with respect to goods is decretory , whereas his will with respect to evils is merely permissive. And Leibniz argues that God's permissive willing of evils is morally permissible if and only if such permission of evil is necessary in order for one to meet one's moral obligations..