There will be times, of course, when you are angry. Just because you don't discipline out of anger doesn't mean you won't feel angry. My kids have done things that made me livid, and it took me between ten minutes and an entire day to calm down. But I've learned that I am not ready to discipline my child until I can do so under control. The best way to do that is to have your child go to his room, or for you to go to your room, or both. There's nothing wrong with taking time to invite God to "clothe" you in the Spirit of Christ, remind yourself that Jesus has already paid for your children's sins, ask God to help you handle your anger appropriately, and then deal with the situation rationally.