https://www.marxists.org/reference/archive/stalin/works/1938/09.htm

https://www.marxists.org/reference/archive/mao/selected-works/volume-1/mswv1_17.htm

https://www.marxists.org/reference/archive/mao/selected-works/volume-1/mswv1_16.htm

The advance requisite and made by Heraclitus is the progression from Being as the first immediate thought, to the category of Becoming as the second. This is the first concrete, the Absolute, as in it the unity of opposites. Thus with Heraclitus the philosophic Idea is to be met with in its speculative form; the reasoning of Parmenides and Zeno is abstract understanding. Heraclitus was thus universally esteemed a deep philosopher and even was decried as such. Here we see land; there is no proposition of Heraclitus which I have not adopted in my Logic. ~ Hegel