Student or Learner
Would anyone please explain the following in bold in easy English?
1. Fear motivation also works for a six-, seven-, or eight-year-old when it comes to acquiring bad habits such smoking. A threat on the part of the parents to "wear his britches out" if they catch him with a cigarette is very effective and will keep that cigarette out of his mouth.
2. The only problem is, when you give the donkey a big enough bite of the carrot, he is no longer going to be hungry and, consequently, his motivation to pull is dramatically reduced. At this point, the only way you can get him to pull is to lighten the load, shorten the stick, and sweeten the carrot.
I can translate the above expressions literally, but I'm not sure their figurative meaning.