Spiritual Power.
That is the most fundamental power for humans.
At the same time,
it is also the most uncontrollable and difficult power to cultivate.
From ancient times to the present.
Some people have pursued it relentlessly throughout their lives but have not made any progress.
Some people have made incredible progress due to fortuitous opportunities.
There is no fixed rule.
It wasn't until secret skills were created,
by various means, that martial artists were able to barely grasp a corner of spiritual power.
Even so,
it is extremely difficult to upgrade spiritual power.
At least from Li Wuji's and Sun Yihe's words, Chen Sheng had never heard of any shortcuts to quickly upgrade spiritual power.
Experience.
Is the only way.
Experience the erosion of desires and stick to your true nature.
Experience despair and pain and move forward with gritted teeth.
Experience the bondage of shackles and break free.