- Kant's a-priori is in the structure of language, not in the mind
- Ethics grounded on the a-priori to shelter it from relativism
- Language is itself the "ultimate foundation"
- Language is a "communicative action between speakers" (a` la Austin)
- Communicative action means the achievement of a consensus between speaker and hearer
- The a-priori is "public", not solipsistic, because language language is social in nature