Christian apologists argue that the testimony of the miracles of Jesus provide evidence for Christianity. Hume tries to undermine this argument by pointing out that miracles are said to occur in other religious traditions and so miracles do not give us reason to believe in Christianity over the alternatives. Thus, competing miracles act as an undercutting defeater for the argument from miracles for Christianity. Yet, before Hume, Locke responds to this kind of objection, and in this paper I explain and (...) defend his response. In short, Locke argues that God will ensure that there is more evidence for Christianity (if true) and this greater evidence is an undercutting defeater for Hume’s competing miracles defeater (i.e., it is a defeater-defeater). If so, then, as Locke argues, competing miracles do not weaken the evidence from miracles for Christianity. (shrink)

Since Leibniz's time, Cartesian mental causation has been criticized for violating the conservation of energy and momentum. Many dualist responses clearly fail. But conservation laws have important neglected features generally undermining the objection. Conservation is _local_, holding first not for the universe, but for everywhere separately. The energy in any volume changes only due to what flows through the boundaries. Constant total energy holds if the global summing-up of local conservation laws converges; it probably doesn't in reality. Energy conservation holds (...) if there is symmetry, the sameness of the laws over time. Thus, if there are time-places where symmetries fail due to nonphysical influence, conservation laws fail there and then, while holding elsewhere, such as refrigerators and stars. Noether's converse first theorem shows that conservation laws imply symmetries. Thus conservation trivially nearly entails the causal closure of the physical. But expecting conservation to hold in the brain simply assumes the falsehood of Cartesianism. Hence Leibniz's objection begs the question. Empirical neuroscience is another matter. So is Einstein's General Relativity: far from providing a loophole, General Relativity makes mental causation _harder_. (shrink)