Good thoughts, good words, good deeds, Zarathustra

Zarathustra is primarity known in western countries for the written book: "Thus spoke Zarathustra" by Nietzsche.
He probably lived before the Achaemenian dinasty (600 to 330 bc) he was a philosopher and also prophet of the persian religion, the zoroastrianism.
He is credited with the autorship of some books: the gathas and the avesta. Zarathustra in his teaching emphasizes the righteousness and the way of thinking, unlike the christian fate that emphasizes the love and the feelings.
His most famous teaching is: