In fact, the real lesson from all this is that you should never let people work on more than one thing at once.
That had been his first real lesson as a soldier.
It had been one of his first real lessons in high-level politics.
But the real lessons from this story are more complicated.
It was her first real lesson in logic, and a giant one.
"We'll take her outside in a little while and have a real lesson."
Though I hope he's learned the real lesson in this.
Let this be the real lesson to all of us.
It had abandoned its traditional role, but we failed to learn any real lessons from this.