The King's Mirror (Speculum Regale—Konungs Skuggsjá).
Translated from the Old Norse with Introduction and Notes by Laurence Marcellus Larson (New York: Twayne Publishers, Inc., & The American-Scandinavian Foundation, 1917), pp. 205-206:
Remember that many a man lives but a brief time, while his deeds live long after him; and it is of great importance what is remembered about him. Some have reached fame through good deeds, and these always live after them, for one's honor lives forever, though the man himself be dead. Some win fame by evil deeds and these men, though they be dead, bear a burden of lasting disgrace when their deeds are recalled; their kinsmen, too, and all their descendants after their days have to bear the same dishonor. Those, however, are most numerous who drop away like cattle and are remembered neither for good nor for evil; but you shall know of a truth that such is surely not the purpose of mankind; for all other creatures were made for the pleasure and subsistence of man, while man was created to enjoy the glories of both this and the other world, if he is to realize the purpose of his creation. Every one, therefore, while he still lives, should strive to leave a few such deeds after him as will cause him to be remembered with favor after he has departed this life.