Awareness quality is that it will be aware even when one goes through happiness or sorrow.
The mind creeps from the back door and often questions the necessity of awareness in our life. It has been seen and observed that the avatars of the godliness always had to face all the prarabdh karmic burden in this life; whether physical or emotional. The mind then, would ask, why to suffer at once if one can not bear the burden, if the life karma would not decrease, more so it may even increase. The reaction will decrease for sure, but the things that life has to show to us, will be the same even more. Now since the enlightened will not be taking birth again, hence universe has its measures to make sure that the karmic balance will be maintained.
But the mind if goes into the debate, says that happiness and sadness will remain nonetheless, there is no point of awareness, then remember one thing that, yes happiness and sadness will be there, the emotions as it is, but the thing is the mind does not like sadness. it does not like poverty, pain, sadness and hankers towards pleasure, happiness. In doing so, it will gather even more pain and discomfort, since one may need to move against the flow. Yet the mind is never fulfilled.
Quite the irony on the mind's part. At one face of the coin it says happiness and sadness it will gladly accept hence no need for awareness, yet on the other face, it runs away from sadness and hankers towards happiness.