Found this when trying to send a condelences email to a relative !
...the pain never truly goes away, it just gets smaller and condensed, tucked away in a corner somewhere in the deep recesses of the heart. There it remains at a constant low level ache, which with time may be overridden. There may be times when a site, a smell, a place, a song, an anniversary or birthday will trigger the old memories and the intensity of the grief and loss will return again. These feelings often arrive without warning and can be just as painful making one feel as though he/she was experiencing the loss anew.