You should never have to say hello or goodbye. Even at work sometimes and I know this is very unpopular is that if I'm going to work every single day I don't think you should have to hug people hello every single day when you come to work. I saw you Monday!
A lot of me is very up and you have to have light and shade. They are both important and you have to be able to balance them. You have to admit that sadness is part of you and that it enriches you. I use it in my work.
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If you do what you love you'll never work a day in your life.