As I have seen Ahura Mazda with my inner sight. 

  (Gathas: Yasna  45-8) 

https://zarathustra.ca/zarathustra

Zarathustra: The name "Zaratha" originates from Persian, where "Zar" means gold and "Ushtra" means light or shining, similar to "Astra" or "ستاره" in Persian. Previously known as Spitama, which translates to "pure," Zarathustra's name signifies a combination of gold and radiant light or star, representing his profound significance.

 “The one who possesses the Golden Light”

 Determining an exact date for Zarathustra's life is challenging due to limited historical information. One approach involves studying the language in his self-composed hymns known as The Gathas. However, many scholars estimate he lived around 5000 to 7000 years ago. Zoroastrianism, the religion he founded, became the state religion for three Persian empires spanning from 550 BCE to 651 CE.

Zarathustra gained insight into Mazda (The Ultimate Wisdom) through his inner awareness and conscience. He encountered Ahura Mazda (The Ultimate Wisdom) through mystical experiences and contemplation within himself.

O, Lord of Life and Wisdom, when I realized Thee in my mind as the First and the Last of Creation.

(Gathas: Yasna 31-8) 

Zarathustra didn't aim to create a new religion for everyone. He wanted us to use our intelligence and choose the path of Wisdom, no matter where we find it. He didn't suggest using drugs or shortcuts to feel good. He also didn't want us to act like robots, following set rules from scriptures or societal norms. For him, religion is about freely choosing based on our consciousness and intelligence, not blindly obeying due to fear.