This Gospel also puts the accent on Jesus’ preaching “method”, that is, on his use of parables. “Why do you speak to them in parables?”, his disciples ask (Mt 13:10). And Jesus answers distinguishing between them and the crowd: to his disciples — namely to those who have already decided for him — he can speak openly about the Kingdom of God, to others, instead, he must proclaim it in parables, precisely to encourage their decision, conversion of the heart; indeed, by their very nature parables demand the effort of interpretation, they not only challenge the mind but also freedom. St John Chrysostom explained: “And this he [Jesus] says to draw them unto him, and to provoke them and to signify that if they would covert he would heal them” (cf. Homily on the Gospel of Matthew, 45, 1-2).
Basically, God's true “Parable” is Jesus himself, his Person who, in the sign of humanity, hides and at the same time reveals his divinity. In this manner God does not force us to believe in him but attracts us to him with the truth and goodness of his incarnate Son: love, in fact, always respects freedom.
[Pope Benedict, Angelus, 10 July 2011]