Those who choose to be happy, whatever be the circumstances, will try and be happy. This is not always possible because we are faced with so many challenges and sometimes we get caught up in the cobweb of pain alternating with pleasure. The permanent solution is to go deep within and find that there is a great deal of happiness which is not affected by any outward happening. It's a fountainhead of all happiness inside, which is why it is called Satchidananda.