You cannot change the environment, but you can change yourself.
You cannot change who you are, but you can change your values and habits.
You cannot change the past, but you can change the present and future.
You cannot change yesterday, but you can change today and tomorrow.
You cannot change the fact, but your can change your attitude.
You cannot change the weather, but you can change your mood.
You cannot always feel happy, but you can always put a smile on your face.

– Dr T.P.Chia