Dry atmosphere marked the age of Krishna. The predominating elements then were internal strife, jealousy, greed. So he preached and founded his teachings on the gospel of love and gaiety, so that people began learning lessons in them and developing love.
The hopelessness of the situation in Zoroaster’s time, when people progressed neither materially nor spiritually, made him base his system so as to make them live life of the world, yet be spiritually inclined in search of God and Truth. He enacted certain laws and made it incumbent on his followers not to marry more than one woman and not to regard any other with a lustful eye. He founded his religion on the tenets of good thoughts, good words, good deeds.
In reality all these Avatars were the manifestations of the same One Divinity, devoid of desires and above lust, greed, and anger.
–Teachings of Meher Baba, compiled by Naosherwan Anzar, p124