Jamieson, Fausset and Brown on Luke 18:34

34. understood none, &c.--The Evangelist seems unable to say strongly enough how entirely hidden from them at that time was the sense of these exceeding plain statements: no doubt to add weight to their subsequent testimony, which from this very circumstance was prodigious, and with all the simple-hearted irresistible.

Lu 18:35-43. Blind Man Healed.

In Mt 20:29-34, they are two, as in the case of the Demoniac of Gadara. In Matthew and Mark (Mr 10:46-52) the occurrence is connected with Christ's departure from Jericho; in Luke with His approach to it. Many ways of accounting for these slight divergences of detail have been proposed. Perhaps, if we knew all the facts, we should see no difficulty; but that we have been left so far in the dark shows that the thing is of no moment any way. One thing is plain, there could have been no collusion among the authors of these Gospels, else they would have taken care to remove these "spots on the sun."