I, not events, have the power to make me happy or unhappy today. I can choose which it shall be. Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, today, and I'm going to be happy in it.

Julius Henry "Groucho" Marx (1890 CE-1977 CE), Julius Henry "Groucho" Marx was an American comedian, actor, writer, stage, film, radio, and television star. He is generally considered to have been a master of quick wit and one of America's greatest comedians.