Reaction causes rebirth
Buddha is passing. Someone abuses him. He listens to it, then turns to Ananda and says - "Ananda, this was a long debt. Now it is paid. In some life I must have abused him. Now no more chain. "Thank you, friend" Buddha said to that man. "Now the account is closed. I am not going to react" - Buddha says, "Reaction is rebirth. If you react, you will have to be born again and again because you are in a chain. Accounts are not closed. Every thing is open".