What's your view, worldly or Biblically? Do you lash out at others for a wrong they've done to you? Or have you intentionally hurt someone because you thought they were going to do something to you first?
The worlds says to "do unto others as they have done to you," or it's a "do unto others before they can do it to you" mentality. Lot's of people live by this view and think it's ok to treat people wrongly just because they feel like it.
God sees it another way. He tells us that "as ye would that men should do to you, do ye also to them likewise" (Luke 6:31). Jesus was always teaching His disciples about loving God and loving others, just like He teaches us. Remember, when you do something, whether good or bad, you do it not only to the person you have targeted, but you do it to God as well. Jesus said that "as ye have done it unto one of...my brethren, ye have done it unto to me" (Matthew 25:40).
Stop and think about that before you "do unto others." Take time to pray to God and ask Him to help you to "do to them likewise" in the Biblical way.