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The whole purpose of the coming of the Word into the world is to produce people in whom the power of the kingdom will bear fruit. But since the kingdom is fully, albeit mysteriously, present in the Word
(since, in other words, the Word's fruitfulness is not in question but is already an accomplished fact), it is chiefly for our sakes that the parable enjoins the necessity of response. The biggest difference made by responses to the Word is the difference they make to us, for us, and in us. They decide not whether the Word will achieve his purposes but whether we will enjoy his achievement - or find ourselves in opposition to it.
Admittedly, I am leaning once again in the direction of a descriptive rather than a prescriptive interpretation ofJesus' words. What he is saying in this parable seems to me to be of a piece with all his other loving, if often sad, commentaries on our condition. He is not threatening some kind of retaliation by the Word against people who fail to make the best response; rather, he is almost wistfully portraying what we miss when we fall short and fail to bear fruit.
And there is the Word. In the case of even the most promising of the deficient responses to the sowing of the Word (namely, in the verse about the seed that fell among thorns - Matt. 13:22; Mark 4:18), the result specified is that it becomes dkarpos, without fruit, unfruitful. For a plant, the failure to bear fruit is not a punishment visited on it by the seed, but an unhappy declination on the plant's part from what the seed had in mind for it. It is a missing of its own fullness, its own maturity - even, in some deep sense, of its own life. So too with us. If we make deficient responses to the Word, we do not simply get ourselves in dutch; rather, we fail to become ourselves at all.
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Robert Farrar Capon (Kingdom, Grace, Judgment: Paradox, Outrage, and Vindication in the Parables of Jesus)