Actually, the book where you read it (the Sally Lockhart mystery "The Ruby in the Smoke") gives the answer later on. It's "By the time you read this I will be dead. May I be as swiftly forgotten."
In french, it means :
Avant que tu lises ceci, je serai mort; si seulement ma mémoire s'éloignait aussi rapidement de l'âme des hommes.
it means:
Before you read this, I will have died; so only my memory moved away also quickly from the heart of the men.
Memoria - album - was created in 2004.
Memoria autógrafa was created in 1829.
Memoria negra was created in 2006.
The duration of Memoria negra is 1.63 hours.
¿Estás recordando alguien? is "Are you remembering someone?" "I remember someone" is "Recuerdo alguien."
Memoria - 2009 is rated/received certificates of: Ireland:15
Memoria is from Latin, where it means "memory" or "remembrance."
It is... memoria memoriae memoriae memoriarum memoriae memoriis memoriam memorias memoria memoriis
Archivo Nacional de la Memoria was created in 2003.
In memoria di me - 2007 is rated/received certificates of: Italy:T Netherlands:AL
The cast of Memoria Indeseable - 1998 includes: Javier Cea
The cast of En memoria - 2007 includes: Johan Orozco