After all, that's what most of us do when we lose someone in our family – especially if the loss is unexpected. We're shaken from our routines, and forced to look inward. We reflect on the past. Did we spend enough time with an aging parent, we wonder. Did we express our gratitude for all the sacrifices they made for us? Did we tell a spouse just how desperately we loved them, not just once in awhile but every single day?

So sudden loss causes us to look backward – but it also forces us to look forward, to reflect on the present and the future, on the manner in which we live our lives and nurture our relationships with those who are still with us. We may ask ourselves if we've shown enough kindness and generosity and compassion to the people in our lives. Perhaps we question whether we are doing right by our children, or our community, and whether our priorities are in order. We recognize our own mortality, and are reminded that in the fleeting time we have on this earth, what matters is not wealth, or status, or power, or fame – but rather, how well we have loved, and what small part we have played in bettering the lives of others.

That process of reflection, of making sure we align our values with our actions – that, I believe, is what a tragedy like this requires. For those who were harmed, those who were killed – they are part of our family, an American family 300 million strong. We may not have known them personally, but we surely see ourselves in them. In George and Dot, in Dorwan and Mavy, we sense the abiding love we have for our own husbands, our own wives, our own life partners. Phyllis – she's our mom or grandma; Gabe our brother or son. In Judge Roll, we recognize not only a man who prized his family and doing his job well, but also a man who embodied America's fidelity to the law. In Gabby, we see a reflection of our public spiritedness, that desire to participate in that sometimes frustrating, sometimes contentious, but always necessary and never-ending process to form a more perfect union.

And in Christina…in Christina we see all of our children. So curious, so trusting, so energetic and full of magic.

So deserving of our love.

And so deserving of our good example. If this tragedy prompts reflection and debate, as it should, let's make sure it's worthy of those we have lost. Let's make sure it's not on the usual plane of politics and point scoring and pettiness that drifts away with the next news cycle.

The loss of these wonderful people should make every one of us strive to be better in our private lives – to be better friends and neighbors, co-workers and parents. And if, as has been discussed in recent days, their deaths help usher in more civility in our public discourse, let's remember that it is not because a simple lack of civility caused this tragedy, but rather because only a more civil and honest public discourse can help us face up to our challenges as a nation, in a way that would make them proud. It should be because we want to live up to the example of public servants like John Roll and Gabby Giffords, who knew first and foremost that we are all Americans, and that we can question each other's ideas without questioning each other's love of country, and that our task, working together, is to constantly widen the circle of our concern so that we bequeath the American dream to future generations.

I believe we can be better. Those who died here, those who saved lives here – they help me believe. We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us. I believe that for all our imperfections, we are full of decency and goodness, and that the forces that divide us are not as strong as those that unite us.