I need an explanation of 𝘵𝘩𝘦 𝘳𝘦𝘴𝘵 𝘰𝘧 𝘵𝘩𝘦𝘴𝘦 𝘸𝘪𝘵𝘩 𝘮𝘺 𝘩𝘪𝘨𝘩 𝘴𝘤𝘰𝘳𝘦𝘴

I mean is it good or bad to have a high score in emotional stability ?    

Of course.  Consider the inverse:  Would it be good to have a high score in emotional instability?