 2. The Neo-Kantians put forward a suite of arguments to show that philosophy is independent of psychology. Logic, or the theory of knowledge, concerns what is objective, not what is subjective, as psychology does (Cohen 1883: §6). It does not concern itself with the mental processes of subjects, with their cognitive apparatus, or with empirical results about human sense organs or nervous system. As Windelband 1883 put it, psychologistic philosophers employ the “genetic method” trying to find the justification of some part of our knowledge by tracing empirically its causal antecedents. The correct method, however, is the “critical method”, which distinguishes what he calls “factual” from “teleological” or normative validity. The critical method is the only correct method, because the fact that we do believe something, or even that all humans by some biological necessity have to believe it, does not yet solve the critical question: what we ought to  believe.[6]  For these reasons, the Neo-Kantians sharply distinguished a priority from innateness—a distinction they claimed was obscured by philosophers such as Helmholtz and Lange.