If you’re operating a plough, you need to make a straight row. If you’re looking back at your house—there are your friends waiting for you; there’s dinner being cooked; there’s your bed, which you left too early and will get back to late—you’re going to make a crooked row. And each row that follows will be worse. But in the mouth of Jesus, this country wisdom takes on a new meaning: If you put your hand to the plough of discipleship and look back, you’ll never be fit for the kingdom of God.