If you eat with the devil, you need a (very) long spoon so that you can keep your distance. If you mix with bad people, you should be careful not to be influenced by them. A warning not to get too close when dealing with evil people.
If you are going to be killed for stealing a lamb, then why not steal a sheep (which is bigger and more valuable)? In general, it means that if you are going to get the same punishment, you may as well commit the greater offence.
1) If a bad person can become good, a very bad person can become very good. Someone with great energy for doing bad, may, when he chooses, apply it equally to doing good. 2) Converts are the most zealous. In a day-to-day sense, for example, someone who has given up smoking may preach more about the virtues of not smoking than someone who never smoked.