The necessary condition refers to the judgment relationship that there is no result without a condition, and that a condition may not have a result. It is a condition that is opposite to a sufficient condition and a sufficient and necessary condition. Which of the following is not a necessary condition relationship:. ['Only by admitting mistakes can we correct them.', "It's raining, the ground must be wet.", 'Disrespect for others cannot be respected by others.', 'Horses can run well only if they eat enough grass.']