Sometimes it's an affliction and sometimes a gift.
Sometimes it's chronic and sometimes it's contagious enough to start an epidemic.

You're as young and irresponsible as the wind.

You've never grown up.

God knows whether or not you ever will.

But Brian has.
There's the clash." "Go on," said Kenny with a dangerous flash of interest in his eyes.
"You've an undeniable facility, John, with what you call the truth." "It's an unfortunate characteristic of highly temperamentalized individuals--" "Painters, Irishmen and O'Neills," put in Kenny with sulky impudence.
"That they frequently skirt the rocks for themselves with amazing skill.