>>4352775As far as I know, Goatis' philosophical worldview is just pure empiricism (i.e the only things that exist are those which are or can be perceived by the senses), discounting abstract concepts like morality, numbers, time, etc. Aside from the obvious problem of the human senses being imperfect and therefore not wholly reliable on their own (e.g a tree appears smaller when it's further away, but it is the exact same size regardless of its position in relation to the observer, or in the case of psychotic mental illness, perceived noises or smells that exist only to the observer and not outside of their experience), it still doesn't address the fact that the concept of truth is an abstraction and does not come from sense experience itself. If truth doesn't exist or is not real, then his argument is self defeating, but if it is, then it means it does not come from empirical observation.