Quote Pictures Grettir the Strong By thehistorianshut - July 14, 2018 Facebook Twitter ReddIt Pinterest Tumblr Email Grettir the Strong (11th century) “Only what is tested is known.” Spoken by the character, Grettir, in the anonymously written Grettir’s Saga (c. 14th century), chapter 34, translated by Jesse Byock (Oxford World’s Classics, 2009). Like this:Like Loading...