In Zoroastrianism, the purpose in life is to "be among those who renew the world…to make the world progress towards perfection". Its basic maxims include:

Humata, Hukhta, Huvarshta, which mean: Good Thoughts, Good Words, Good Deeds.

There is only one path and that is the path of Truth.

Do the right thing because it is the right thing to do, and then all beneficial rewards will come to you also.

https://en.wikipedia.org/wiki/Zoroastrianism