Women are very familiar with hair pins because they are used to hold hairs on the head in place. There are other types of pins that are used for very different purposes. Some cause pain, and others do not. If you are a disciple of Jesus, you should know that your role in his kingdom will never involve causing pain to others.
However, there are times when, in the course of defending yourself, you will indeed cause pain. God expects that you will always seek to defend yourself from any and all attacks, whether physical, verbal, spiritual, or otherwise.
The Lord God Almighty El Shaddai