Thus, it may be instrumentally rational to be epistemically irrational about these matters. Searle calls any value judgment epistemically subjective. Schlesinger believes that the intuitive reaction to these two scenarios is epistemically justified. Hanley believes that time travel is logically, physically, and epistemically possible. Searle calls any value judgment epistemically "subjective". Standpoint theory defines a specific social perspective as epistemically privileged. The philosophical problem of actual infinity concerns whether the notion is coherent and epistemically sound. However, one's belief that someone else is conscious is not epistemically self-evident.