With the Anugraha of Ishta the sadhaka obtains Jnaana. First the Jnaana abou the Ishta Deva and Ishta Devi. Sadhaka understands, realizes the actual form of Ishta. In reality every form of of Gods represents Para BrahM and Para Shakti.
In reality both are beyond any forms and definition. But with Svarupa Jnaana the sadhaka starts to understand the formless, Niraakaar Para BrahM and Para Shakti. This intensifies the Sadhaka's Upasana.
Now Upasana is not just some outward rituals or following some disciplines but it becomes more intense with the connection and mercy of the Ishta. This leads the sadhaka towards the experience of realizing the Nirguna Svarupa, the formless entity of the highest one. And as a result of meditating and worshipping the formless She or He rises to realize her or his own self. Which is called Aatma Jnaana.