This quote is expressing how pointless it is to try and do something that doesn’t make sense. Specifically, it notes that trying to achieve peace through fighting is a hopeless endeavor. This is because fighting is usually associated with violent behavior and it’s impossible to achieve a peaceful outcome through violence. It is similarly impossible to restore someone’s virginity through sexual activity; it is oxymoronic, like “peaceful fighting.” In other words, no matter how hard someone tries, they cannot realistically expect to find peace or restore virginity by relying on these counterproductive tactics.