Gu Zongchen, was naturally a disciple of Buddha, highly gifted with versatile abilities, and was an expert at convincing people with reason and logic.
This reason involved both physical laws and moral principles.
When facing enemies, he would first rely on physics, then morality. As long as his physical facts were sound, everyone would sit down and listen to his moral principles.
Lu Dong was the perfect example.
When he first arrived, he was quite arrogant, but later on, he learned to engage in religious dialogue and debates.
Lu Bei was different.
Gu Zongchen failed to convince him with physics, as for morality, Lu Bei's thinking was elusive, full of crooked logic, Gu could not even keep up with his pace, let alone debate him.
If he were to keep up, at an equal level, Lu Bei's vast experience would only speed up his defeat.
"Mr. Xin, you're right. That's the part that I missed."