@Olivier5,
good question.. it seems paradoxal maybe it is but so is the rest of nature.
justified true belief concept..
there is no truth only perspective.
a belief is faith orientated.
a belief is not changing and the real word is, thus if even true it would not be for long. something justifed is very subjective. belief is subjective truth is subjective.
look at historical examples of what human thought they knew its contrary to others so called knowledge. through out time it changes.
knowledge as understanding, we understand nothing, we perform acts but we do not know why or the purpose or how we do so, are heart beats without command so our mind thinks without us performing the thought, the distinction "i" does not exist. it exist as illusion but not really.
how do i know, i don't, these are just thoughts produced by my programming, for some reason to make me act in a certain way. all i can do is speculate.