I haven't kept it a secret that I am no longer religious, but I think Ash Wednesday is a good time for secular reflection as well.
The message is important regardless of what you believe. Ash Wednesday leads into Lent, a season of reflection, penance, and forgiveness.
Forgiveness is an important thing - knowing when you need to grant it, and when you need to ask for it. And asking for forgiveness can be difficult and humbling, but also important.
Every Ash Wednesday I repeat the following phrase to myself as a reminder that my life will one day end and the material things I gained will mean nothing. It is a reminder to make my imprint on this world a positive one: