"We know from Philo that Herakleitos supported his theory of the attainment of harmony through strife... There is... agreement between a passage of this kind in the pseudo-Aristotelian treatise... The Kosmos, and the Hippokratean work... [B]oth drew from... Herakleitos... made practically certain by the fact that this agreement extends... to the Letters of Herakleitos, which, though spurious, were... composed by some one who had access to the original work."