When happiness is there you cling; when pain is there you escape. This is the natural attitude. If you want to change this natural law and transcend it, when pain is there don't try to escape. Remain with it. You will disturb the whole natural mechanism. You have a headache: remain with it. Close your eyes, meditate on the headache, remain with it. Don't do anything. Just be a witness. Don't try to escape.
When happiness is there and you are feeling especially blissful in any particular moment, don't cling to it. Close your eyes and remain a witness to it all. Clinging or escaping are natural for the dust-covered mind. If you remain a witness, sooner or later you will fall in between because the natural law is to move to the polarity, to the polar opposite. If you remain a witness, you are in between.
