The Science of Being Calm

“act calm and kind regardless of how you feel” is very good advice: you are likely to be rewarded by actually feeling calm and kind. (Location 871)

Situations are constantly evaluated as good or bad, requiring escape or permitting approach. Good mood and cognitive ease are the human equivalents of assessments of safety and familiarity. (Location 1484)

Reminds me of how Killua can keep a calm head in any situation. In the real world, the ideal soldiers, pilots and therapists also do their best work under intense external stress while maintaining mental peace