As for [the seed that] was sown among the thorns, this is the one who hears the word, but the cares of this world and the deceitfulness of riches choke the word, and it proves unfruitful (Mt. 13:22).
In the parable of the sower, Christ intimates that there are four responses to the hearing of the Word of the Kingdom, three negative and one positive. Three of the responses to the Word are responses that are rooted in the heart of man and therefore bear no fruit, and one response in rooted in the work of God and therefore bears much fruit. In each of the negative responses there is the proclamation of the Word (i.e. the sowing of the seed), and in each there is a different enemy that destroys the effectiveness of the Word.