How do you keep your sense of joy?

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Nowadays, it's so hard to maintain a sense of joy. Our world is plagued with moody, crabby, unfulfilled individuals who go around stealing any sense of happiness left in some many of us. For example, that rude cashier at your local convenience store or that one friend who is blatantly honest and constantly brings you down. How do you deal with this type of negativity and how do you conserve your joy?