"The bitterest tears shed over graves are for words left unsaid and deeds left undone," by Harriet Beecher Stowe, is one good memorial saying from Memorialprayercards.com. "As a well spent day brings happy sleep, so life well used brings happy death," by Leonardo DaVinci, is another good memorial saying.
Memorial death sayings are commonly used during speeches dedicated to a deceased loved one during funeral services and engraved on memorial keepsakes. Long memorial quotes are considered appropriate for commemorative speeches while shorter memorial quotes are more common to use for keepsakes and grave stones. Lovetoknow.com, engravedforkeeps.com and memorialprayercards.com have lists of popular memorial sayings.