The most critical factor was that training to unlock the human body's hidden reserves was far slower than cultivating the methodology transmitted by the Immortal Venerable.

As Li Fan studied these texts, he discovered that the difficulty of unlocking the human body's hidden reserves increased exponentially once a person’s power was equivalent to the Golden Core level. 

At that point, it would feel like being chained down by invisible shackles, and every minuscule advancement would require an exorbitant price.

With the same expenditure of effort, the gains from immortal cultivation far surpassed what could be achieved through unlocking the body's hidden reserves. 

Moreover, immortal techniques allowed one to command the energy and laws of heaven and earth. How could the human body's inherent...