Scenario 1. It's the middle of class, and you've been excused to use the restroom. Along the way you find a $100 bill lying in the hallway. Nobody is around to claim it; nor do you know to whom it belongs. Do you pocket the money, or do you take it to the lost-and-found? Scenario 2. You are taking a test, and the teacher leaves the room. You can see the test answers on your neighbor's paper, and you are tempted to check your answers. You won't get caught. Do you consider it cheating? Would you do it? Scenario 3. You are a teacher's assistant, and your job is to record grades. It just so happens you know a few of the students in the class, and they approach you one day to ask for higher grades on their papers. All you have to do is change the letter grades on the score sheet, and the teacher will probably never find out what happened. Knowing that you would never get caught for changing a grade, would you do it?
