Happiness cannot last; it is temporary so make sure you enjoy it.
When you are happy and having a good time, you have a thought to yourself that this good time will not last. This is the harsh reality of life but in other situations thinking like this is an advantage. When you are sad you feel you will never be happy again because of whatever that just happened, but just think sadness will never last no matter how sure you are that it might.
Life will have many ups and downs but you feel better if you learn to accept it.
Life is not perfect; then again no one said it will be