A happy life is made up of little things-
a gift sent, a letter written, a call made, a recommendation given, transportation provided, a cake made, a book lent, a check sent.
Whoever Carol Holmes is, she has it right. We garner more happiness from doing things for others than for ourselves. It's in the spirit of giving and of service that we are truly able to step out of our self involvement, and by doing so we gain more than we could possibly imagine. Particularly for those prone to depression, doing things for others allows us to stop focusing on self which can prolong the depressive state.
So, go do what Carol Holmes, whoever you are, recommends. Spend some time with a Veteran, or a home-bound neighbour, send a card to a friend in need, donate to your favourite charity. You'd be surprised what happiness karma you'll accrue.