How Important Is Controlling Your Emotions in the Octagon?

Conor McGregor is an emotional person, and i tryd to use that to work for me. But there's been so many fights that i've been over emotionalndtThat blind that has blinded me and made me bad during the fight. I'm getting away from technique because i'm fighting on emotion. A trainer told me one time after a fight, that these emotions are like a fire,. You can use em they can burn you, or you can use them to cook your family's meals. And i kind of took that with me, and i'm just trying to to use that fire to to to push me forward in training...to make me focus.