A tenant farmer is one who resides on and farms land owned by a landlord. The rights the tenant has over the land, and the form of payment, varies across different systems. In some systems, he could be evicted at whim (tenancy at will); in others, he signs a contract for a fixed number of years (tenancy for years or indenture).
Tenacity is about sticking to principles, and in this instance, the principle is that liberation, the bliss of The Self is sustained by remaining within the Five Agnas of the Gnani Purush.
Tenacity was designed by the original scientist of spiritual matters, Dadashri in his famous experiment called The Gnan Vidhi.
The troubleshooting with the tenacity of the Five Agnas is universally applicable and Dadashri calls it the Master Key which opens all locks that block bliss.