A phrase written on a tombstone is referred to as an epitaph.
It's an epitaph.
"this is my tombstone"
"this is my tombstone"
tombstone writing i beleive
An inscription is writing carved into something. For instance the writing on a tombstone.
what are the words on Poe's gravestone
inscription is the word you're looking for.
"Tombstone" comes from the words "tomb" and "stone." Tomb is Greek and stone is Germanic.
Be careful of extraneous words: it is called "writing" not "the writing process."
Shorthand
The answer is by his own instruction.
It is called quoting (or to quote) the person and you should do also giving acknowledgement to the person and in which work he wrote it.