What does it mean to be able to respond to others?

"The man has the ability to respond" means that the man is tongue-tied and can't answer a word.

Source: Spears and shields in Han Feizi Nan Yi during the Warring States Period. An impenetrable shield and an impenetrable spear cannot stand side by side. "

The man was tongue-tied and couldn't answer a word. A shield that can pierce nothing and a spear that can pierce everything cannot exist in this world at the same time.

Extended data:

Spears and Shields tells the story of a man boasting about the spears and shields he sells at the same time, but he can't justify himself because of his contradiction, warning people to speak and act realistically. Often used to satirize exaggerated and contradictory people (or phenomena). ?

The moral of spear and shield is that words and deeds are consistent, and you can't go against the objective laws of things or convince yourself. It is also a metaphor for inconsistency or contradiction in speaking and doing things.

Baidu encyclopedia-spear and shield