There is an interesting story behind this. After the first five preliminary chapters had been completed, one of his disciples took them to Varanasi and recited them on the banks of the Ganges River. The pundits of Varanasi took umbrage at what they called the "pollution" of the holy text in the language of the shudras (the lowest caste). Eknath was summoned to Varanasi and asked for an explanation. He requested that he be given an opportunity to present his work before judgment was passed. This was given reluctantly. In fact, the chief pundit even kept a curtain between himself and Eknath, so that he would not be polluted. Then Eknath started reciting his poem. So beautiful was the melody, so profound the philosophy, and so moving the mystical imageries created by him, that the audience of learned pundits became ecstatic. The chief pundit tore down the curtain and requested him to complete the work in Varanasi on the banks of the Ganges. After completion, the work was paraded on the back of an elephant, through the streets of Varanasi.
This incident that took place at Kashi gave further encouragement to Shri Eknath and he thereafter wrote his book "Rukmini Swayamwar" at Kashi itself within a short time thereafter.