Here's a little video ad for Gretchen Rubin's book, The Happiness Project, which I read and enjoyed. Just to give you a little taste of it. :)
This is one of her "key principles to remember" in her personal quest for happiness:
The days are long, but the years are short
Sometimes it just feels to impossible to remember - in these difficult days of parenting. And sometimes I panic at the thought of how quickly my children are growing. For me, I try to remind myself that I am just doing the best I can, with these long days and short years. And I hope I don't look back someday and chide myself for not doing more, being more, being better. I want to remember that I did the best I could with the challenges I was given. Even though it never seems like enough. This is all I can do.