Empathy depends on your ability to overcome your own perspective, appreciate someone else’s, and step into their shoes. Self-control is essentially the same skill, except that those other shoes belong to your future self—a removed and hypothetical entity who might as well be a different person. So think of self-control as a kind of temporal selflessness. It’s Present You taking a hit to help out Future You.
Impulsivity and selfishness are just two halves of the same coin, as are their opposites restraint and empathy. Perhaps this is why people who show dark traits like psychopathy and sadism score low on empathy but high on impulsivity. Perhaps it’s why impulsivity correlates with slips among recovering addicts, while empathy correlates with longer bouts of abstinence. These qualities represent our successes and failures at escaping our own egocentric bubbles, and understanding the lives of others—even when those others wear our own older faces.
Ed Yong writing in The Atlantic