I manifest emotional stability.

Stability turns out to be infrastructure rather than temperament. Sleep at roughly the same hour. Food that is not decided at nine in the evening. Two people who would answer at two in the morning without first asking what was wrong.

Anyone who seems unshakeable has usually built more of that than you can see from outside. It is boring to construct and completely invisible when it works.

Which is the good news, really. Temperament is hard to change. A bedtime is not.