he's interested in first law, how to tell what is true and what is not.
from there, you can start to address subjectivity v.s. objectivity(descartes, kant, ayn rand et al) then finish off morality (Nietzsche, the man is crazy but the idea is sane).
from there you can go into more practical issues, language, stereotype, logic ( b. russel struggled, but he's on target). some of 老子 is way ahead of those guys, but don't take it literal, e.g. as a religion, it will be too passive close to nihilism.
