I'm glad they got caught. That will 'teach them a lesson'! [=they will learn that they should not do that again]
We 'learned our lesson' the hard way. [=we learned from an unpleasant experience]
They studied the 'lessons' [='teachings'] of the great philosophers.
(..) "The history of my people is great and glorious." And it's . - I'm sorry? - Isn't that when we finish? The termination of the lesson is for the tutor to decide, Bruno, not the pupil. Now, will you please continue. Bruno, there you are. I'm just going into town for an hour. (..)2008 The Boy in the Striped Pajamas