 According to W. K. Clifford, belief beyond the evidence is always morally forbidden, not just irrational. William James countered that belief beyond the evidence is permissible when there is a forced, momentous, live option. Can I survive the destruction of my body, simply by virtue of a strong psychological resemblance with a future person? The answer affects my prospects for immortality. James says that my belief that this is borderline survival does not forbid me from believing that it is survival. Whether I exercise this prerogative depends on my temperament. Since momentous borderline cases are so prevalent in speculative matters, much philosophical disagreement is a matter of personality differences. 