A favorite argument against the existence of Q is simply that no manuscripts of Q have ever been discovered. No more than this bare assertion is usually made. But a little probing shows that this argument has some serious weaknesses to it. In particular, three come to mind: (1) If Matthew and Luke swallowed up Q in their writings, why would we expect to find any copies of Q? Or to put this another way, Luke says that he used more than one source, presumably more than one written source. If so, why haven’t we found it/them? The fact that we haven’t surely doesn’t mean that Luke was not shooting straight with us, does it? (2) Even the Gospel of Mark has few copies in the early centuries, yet it was endorsed as an official Gospel by Ireneaus. Yet this is a canonical Gospel, which apparently was regarded in some…