There was a moment when the urge came up and you watched it instead of acting. Notice that, mark the date if you can, because that is your proof it is possible.

What the research says

In a brain stimulation experiment, disrupting a region involved in holding back impulses increased both impulsive movement and retaliation after provocation, which supports the idea of a narrow window in which holding back is genuinely possible. When you did not act, you were using that capacity rather than getting lucky. It was a small laboratory study of one brain region, not a study of real restraint in real arguments.

Strength of evidence: one line of research. A single study, or a theoretical account.