Locke's theory of property is that the only thing that you own is your body, your body produces labor therefore whatever you put your labor into that becomes your property. Therefore what Locke is stating is that everything on earth is of common use and belongs to everyone, it is not until someone puts their labor into an object and that object becomes that person's property. Thus in this case the only thing that Stan owned was his body and his body produced labor by stirring the soup therefore that soup became Stan's property. Although the soup kitchen is a communal place for homeless or needy families, if Stan wanted to charge the people at the soup kitchen for stirring the soup than he could simply because he instilled his labor into it. In Locke's theory his ideology is that money is a form of stored labor that a person has and can be used in order to gain property.
In life we encounter Locke's theory daily, for example, when we purchase vegetables from a local farmer, those vegetables become ours, although the farmer has put his labor into the crops we used our money to purchase them which makes it our property. Can you think of something that you do that relates to Locke's theory?