One of my favourites is the Polish proverb wandering around facebook. To paraphrase, when drama is going on remember "Not my monkey, not my circus."
I always love Gandhi for inspiring positive quotes.
"Happiness is when what you think, what you say, and what you do are in harmony."
"The weak can never forgive. Forgiveness is the attribute of the strong."
"Live as if you were to die tomorrow. Learn as if you were to live forever."
"First they ignore you, then they laugh at you, then they fight you, then you win."
"Satisfaction lies in the effort, not in the attainment, full effort is full victory."
and my personal favorite,
"No one can hurt me without my consent."
“Things we lose have a way of coming back to us in the end, if not always in the way we expect.” - J.K. Rowling, Harry Potter and the Order of the Pheonix
"In 900 years of time and space, I've never met anyone who wasn't important." - The Doctor, Doctor Who