From Chapter III., Herakleitos of Ephesos
Herakleitos speaks of "wisdom" or the "wise" in two senses. We have seen already that he said
wisdom was "something apart from everything else" (fr. 18), meaning by it the perception of the unity of
the many; and he also applies the term to that unity itself regarded as the "thought that directs the course
of all things." This is synonymous with the pure fire which is not differentiated into two parts, one taking
the upward and the other the downward path. That alone has wisdom; the partial things we see have
not. We ourselves are only wise in so far as we are fiery (fr. 74).