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.
(..) his father Darius at Marathon. The Persians will not stop... ...until the only shelter we will find is rubble and chaos. This chamber needs no history lesson, my queen. Then what is the lesson you would like to leave? Shall I begin to enumerate all of them? Honor. Duty. Glory. (..)2006 300
(..) First... - ...you fight with your head. - Then you fight with your heart. What is it? A Persian messenger awaits you. Do not forget today's lesson. - Respect and honor. - Respect and honor. Councilman Theron. You found yourself needed, for once. My king and queen, (..)2006 300