Heraclitus' time was within the Axial Age, as Karl Jaspers termed it--a period ~ 800 BC -- 200 BC, a time when Gautama Buddha, Confucius, Zarathustra, Hebrew Prophets, Hindu sages, Taoists, and Socrates and Plato taught kinds of universal transcendence. Heraclitus lived in the middle of this, ~ 535 BC -- 470 BC, as did Parmenides.
Heraclitus lived in Ephesus (and Parmenides lived in Elea).
Heraclitus' insights and positions are similar to those of modern physics: a) there is Energy, symbolized as "fire"--the quickest energy known to the ancient Greeks; b) this Energy is geometric, ordered by the "Logos" or Word-Principle which frames the Universe; and c) Energy in its formations is an orderly process, as a general Flow ("flux").
Thus Heraclitus is able to say, describing Schopenhauer, "The world is nothing but a great desire to live and a great dissatisfaction with living," and, describing Nietzsche, the overcomer, "Greater dooms win greater destinies."
Heraclitus shows the awareness of a Jacob or a Hermes Trismegistus (oral teaching of Egyptian Thoth, known to the ancient Greeks as Hermes Trismegistus, and this teaching believed to be contemporary with Abraham, and known to Moses): "The Way up and the Way down are One and the same," and the wisdom of Dr. Maria Montessori: "Man is most nearly himself when he achieves the seriousness of a child at play."
Semi-related: "The Path of the Higher Self;"
"Beams from Meher Baba;"
"Autobiography of a Yogi."