what is the" grace under pressure"

海明威的"压力下的优雅风度"?
Does it come from the quote "courage is the grace under pressure" written by Ernest Hemingway?There are some other cool quotes talking about the "courage" like this to make it easier.
"Courage is not the absence of fear,but rather the judgment that something else is more important than fear."--Ambrose Redmoon
"It requires more courage to suffer than to die."--Napoleon Bonaparte
It is common for people to feel pressure from their whole lives,like social lives,livelihoods,or surroundings.The key is that you should or have to have the courage to face,have the strength to say yes or no,and even have the courage to fail.