Deciding the salvation of someone: two men have an open book in front of their eyes, and their eyes are moving back and forth over the sentences. Each man is enclosed in a sound-proof glass case. One man is reading: the other is mimicking the act of reading. How do you decide who is reading? What criteria do you use? Is it the furrowed brow? But the mimicker has that as well. Is it the movement of the eyes? This won't work either. Two men are writhing on the ground, screaming because they are in pain: but one is acting - the behavior is identical. You shall know them by their fruit: cannot fruit be mimicked? You call a philosopher to discuss the issue of X: he eloquently gives an answer - yet, it could easily be a dunce (skilled in acting) reading from a book. Is the aim of life the much difficult quest of discovering who is really reading or in pain?