Thanks for the very valuable insights Madam H, Master J and Capt. D. I am sure a lot of parents and would-be parents (like me) learned something from what you've shared.
When you truly love your children, you won't hesitate to let them feel pain, if you know they will learn from it. And always, they need to know why you are using the rod. You can't just go your own merry way because you know it is the right thing to do. You have to let the child realize why it is necessary.
I have a friend who spoils her child in an acceptable level especially since the kid is an only child. But of course, a child is a child-- sometimes becoming so obnoxious that the parent lose her cool. My Friend pick up the "rod" so to speak and used it to discipline the child. Naturally, the child cried because of slight physical pain upon tasting her mum's rod. What happened is that the mum pity the child and end up saying sorry just because she used the rod on the kid.
Will this action lose the objective of trying to make the children realize their mistake by letting them feel a little bit of pain?