*(Jupiter came on the throne, Ketu's bed was stood up (ruined); whatever he taught and learned, it became a chain of salutations.)*
This is a profound analysis of the 1st house / 7th house axis. The 1st house is the "throne" (Takht).
When Jupiter sits on the throne in the 1st house, it becomes the absolute king of the chart. However, its direct aspect falls on the 7th house. If Ketu is in the 7th house, the massive, authoritative energy of Jupiter completely overpowers and ruins Ketu's domain (marriage and partnerships—"Ketu ki khatiya khadi ho gayi").
But professionally and spiritually, this person becomes a master. Because they dedicate their life to learning and teaching divine wisdom ("sikhaya seekha jo bohat kuch"), the world bows down to them, creating an endless chain of respect and salutations ("salaamon ki ladi ho gayi").