It is a slight variation (probably a different take or sped up) of Sheridan and G'Kar's conversation in 5x21 Objects in Motion. G'Kar's complete line is "Unnecesary. You see. I believe that when we leave a place, part of it goes with us and a part of us remains. Go anywhere in the station, when it is quiet, and just listen. After a while you will hear the echoes of all our conversations, every thought and word weve exchanged. Long after we are gone, our voices will linger in these walls for as long as this place remains. But I will admit: that the part of me that is going (will) very much miss the part of you that is staying."