How can you achieve eternal sunshine in your mind amidst the chaos in the world? By observing events and people without becoming entangled in them. By not judging an event, people or situation as good or bad. By just letting things be as they are, a deeper intelligence comes into this world and connects you with the presence all around you. Out of this non-attachment, intelligent action happens. You then find yourself doing or not doing something.
You let the sunshine into your mind by getting rid of the dark clouds of suspicion, guilt, anger, sadness, resentment, etc. These are states of being that pass through your existence but you hold on to them as if they were precious and important. Before long, they drag you down and create an atmosphere of negativity. But if you learn to observe, you break the negativity and let the universe do the work. The universe is a living, breathing organism that takes care of you if you let it be. So save yourself a lot of trouble and just be!