Emotions are like muscles
Emotions are like muscles. They can be there when you need them. You can use them or not use them. But the muscles need to be exercised as well. An emotion is an initial reaction to an event that triggers you. The training of the muscle allows you to control your reaction to the trigger. self, emotion, definition, process.
— from The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy) · Don't Mind If I Do: How To Transform Your Life With The Power of Jewish Mindfulness
In the book
Start with the simplest definition. An emotion is an initial reaction to something that triggered you. That is all it is at the first instant — a reaction, not a verdict. — The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy)