Sarah: No matter how hard you fight, you can never bring those things back, Gwen.
They belong to the past now. Your life... you... you belong to the present; no, to the future...
Let me tell you something I learned only after my death.
Sarah: We view this world through eyes cast forward, so we can see the future stretching
out in front of us, beckoning us onward through our lives. So, if you must fight, fight for the
life you want to lead... for the future you want to live in.
Sarah: If you fight to fix the regret of the past, you will lose. The past cannot be beaten.
As you said, we shouldn't regret the words we never got a chance to say... or the life we
never got to lead. Live your life, my little girl. That is all a mother wants... all I ever wanted.
-- Sarah, Gwen's Mother, in The Underworld.
Or Sarah, Gwen's Mother, in The Underworld. (official wiki)