The author of Luke admits himself as an interpreter of earlier material and not an eyewitness (Luke 1:1-4). Many scholars think the author of Luke lived as a gentile, or at the very least, a Hellenized Jew. Some scholars think that the Gospel of Matthew and Luke came from the Mark gospel and a hypothetical document called "Q" (German
Quelle, which means "source"). [Helms; Wilson] . However, since we have no manuscript from Q, no one could possibly determine its author or where or how he got his information or the date of its authorship. Moreover, other scholars challenge its existence and those who do think Q existed have problems explaining it. Again we get faced with unreliable methodology and obscure sources.