Happiness depends only on your mind. When the mind is free of past impressions and future cravings, happiness is there.
Don't postpone your happiness until some perfect future date. Be happy now, tomorrow will take care of itself.
Diwali means to be in the present, so drop the regrets of the past and the worries of the future and live in the moment. It is a time to forget the bickering and negativities that have happened through the year. It is a time when you throw light on the wisdom you have gained and welcome a new beginning.