Fragments by Heraclitus
Heraclitus of Ephesus Twenty-five hundred years before Einstein, Heraclitus of Ephesus declared that energy is the essence of matter, that everything becomes energy in flux. Heraclitus is considered be one of the prominent thinkers of Stoic philosophy. (Read more about Stoic Philosophy.) His fondness for word play, and his belief in unity of opposites have resulted …