 Here Descartes allows that there exists the possibility that God create alternate eternal truths only if God’s will is mutable, but of course Descartes holds that God’s will is wholly immutable, and immutable for eternity. God is still free of course, but in a way that squares with His immutability: divine freedom is to be understood in terms of indifference and independence. The worry that is starting to arise is that if God is the immutable and eternal author of all reality – the eternal truths and everything else that exists – then there does not exist the possibility that God will an alternate series of creatures, and hence God does not author that possibility, but instead everything that happens happens necessarily. Descartes subscribes to a version of the Spinozistic view that divine freedom is a matter of  indifference,[17]  and there is also some systematic evidence that Descartes accepts the Spinozistic doctrine of necessitarianism. As Descartes recognizes in the 15 April 30 letter to Mersenne, we might encounter some cognitive dissonance in recognizing God’s freedom as  omnipotence.[18]  He appears to subscribe to the view that the eternal truths are necessary and that everything else that happens is necessary as  well.[19]  As he is reported to have said in Conversation with Burman: