“Sambandha, Abhidheya, and Prayojana”
One could say Sambandha means understanding who we are , our origins, our purposes, our potential.
This is the science of consciouseness, its cause , its origins , its perfected state , its artificial states , how it comes to be in artificial or perfected states . Who is ultimately responsible for such states , who is creating facilities as well as governance and rules of compliance that govern artificial or perfected states . The aforesaid and a lot more are what’s meant as essential Sambandha knowledge, which Srila Jiva Goswami delineates in his Tattva Sandarbha.
Sambandha means to establish a relationship, you can’t have a relationship without knowing something of the persons you’re having a relationship with .
So, in essence, Srila Jiva Goswami is giving the literal science of consciousness, along with its source and the purposeful interactions that can be had with the source.
When those sorts of knowledge are clear , then one can act in a relationship properly with respect and humility, and after acting, love can be further and further developed. Actually, love is an action word , and in the highest realms of consciousness, actions of love go one way only ,to exclusively give selfless pleasure without any personal considerations for one’s own benefit.
The mother and child relationship is a glimmer of this selfless love .