The surge of fighting spirit permeated the space between the sky and land. Mu Chen had his eyes tightly shut as he immersed himself in that sea of fighting spirit, floating and sinking along with it. Yet, every time he attempted to assimilate into that surge of fighting spirit, it would become quite difficult.
He could manipulate these fighting spirits, but it was extremely difficult to assimilate and truly fuse together with them. If he was unable to do so, then the so-called 'to control with heart' would merely be empty talk.
Nevertheless, Mu Chen did not feel dejected due to the continuous failures, as he understood the faintly discernible existence of the fighting spirit. Its birth depended on a person's willpower, while its strength depended on the merging of willpower and spiritual power. It was precisely the fact that every fighting spirit had a different willpower, which made it difficult to perfectly assimilate into them.