‘When he was alone, they that were about him with the twelve’ – the twelve disciples he had called, and an unknown number of others who followed him most closely – asked the meaning of the parable. Matthew tells us that they also asked about his use of parables in general.
Salvation, turning to God and finding him, is something that has to be done with great sincerity. There has to be genuine repentance; there has to be a longing and a desire for salvation. But by nature, as we are, we don't have that desire; we don't want that. We are committed to our own lives and our own way. We think this world is, on the whole, wonderful. We are going to make our way in it. We are going to make it work for us. We are going to be happy in it. We are going to be free to do what we like, to sin as we like. We don't want to be tied to the standards of God; we recoil from that. And so we will not hear and grasp this message. The degree of difficulty presented by a parable will completely put us off.