Here are a few quotes on memory I'm partial to:
"It's a poor sort of memory that only works backward."
-- Lewis Carroll (1832 - 1898)
"Memory feeds imagination."
-- Amy Tan (1952 - )
(perfect if the engraving is charged by the letter

)
"One must have a good memory to be able to keep the promises one makes."
-- Friedrich Nietzsche (1844 - 1900)