Some sage said once that no one would have worked in this world, if humans would not have got a stomach. Everything else comes later. Whatever you want to achieve or reach to, it would fail when you are not well fed. You cannot even focus on God if you are hungry. So much to eat and satiate. However, whenever we are eating we need to remember that we need to clean also. As I said, everything from life teaches as, it can be as small as eating food or as big as the challenges we face. How we take those lessons depends on us. Now lets see what are the left overs, we can have some left overs in the kitchen, where the meal was cooked or in the plate, where we had eaten. Now if you have eaten once in that plate, can you eat again, until its cleaned? Can you cook in the kitchen again with the left overs of the previous day? If you do either, you very well know what kinds of health problems you might get into. You might get fungal infections, stale meal etc etc.
When we are so precautious while cooking a meal in the kitchen and eating it, why not about cooking a meal in life? Meal in the kitchen is cooked over again and again and if you do a mistake, it can be altered, meal of the life does not give you the opportunity to keep cooking it again. However, you may get stomach infection called as food poisoning and when you recover, you start eating normal food again. same way is life, if you cook a wrong meal or eat in a plate which was not cleaned after previous meal, you get food poisoning. You need to keep cleaning left overs from life. So what are the left overs of life? They are your prejudice about people, hangovers of past events, the notions which you carry about certain people and imply on others, the past which you keep carrying, you hurt yourself more when you carry past. So you need to keep cleaning the left overs to cook a fresh meal so that you can have new energy, new nourishment, new growth, instead of food poisoning. if you arent careful about cooking a fresh meal with fresh ingredients, you will just end up poisoning your life.