The comma does all the work. People who carry unhealed pain often pass it on - through anger, control, cruelty or withdrawal - frequently without realising it. Psychology recognises this in cycles of trauma, and many ethical traditions see it in the way one wrong breeds another. The saying is not an excuse for harm but an invitation to understand it. Seeing the wound behind someone’s behaviour can soften judgement without abandoning boundaries. And it carries an implied hope: if hurt people hurt people, then healed people can help heal people. Breaking the cycle usually starts with tending our own wounds.