Emotion blurs logic
I believe this one from experience. When emotion takes over, logic goes blurry. I've watched it happen in myself, and the results were never good.
The clearest example for me is relationships. An emotional reaction in a relationship — snapping back, getting defensive, saying exactly what you feel in the moment — costs more than it's worth. At some point I had to ask myself an honest question: what matters more, this relationship or my feeling right now? For me, the answer was the relationship. The feeling would pass in an hour. The damage from reacting might not.
That's the difference between reacting and responding. Some people call it emotional intelligence. I'd call it a choice, except it doesn't feel like one in the moment, because emotional reaction is basically instinct. When the situation is right in front of you, thinking logically is genuinely hard. Knowing "don't react emotionally" is easy. Doing it is not.
So I built myself two anchors.
Understand the other perspective. Most of my emotional reactions came from seeing only my side. When I force myself to ask why the other person might be acting this way, the heat drops fast. It's hard to explode at someone whose reasons you're honestly trying to understand.
Feel confident in myself. A lot of overreaction is really insecurity in disguise: feeling attacked, needing to defend. When I'm secure in who I am, other people's words lose the power to trigger me. I can hear something hard without treating it as a threat.
I won't claim these two cover everything. But they're what moved me from reacting to responding, and I keep practicing them every time a situation tests me.