When we purchased our home, we also inherited an established grapevine. As gardening novices, my family invested considerable time learning how to prune, water, and care for it. When our first harvest came, I popped a grape from the vine into my mouth—only to be disappointed with an unpleasant, sour taste.

The frustration I felt about painstakingly tending a grapevine, only to have a bitter harvest, echoes the tone of Isaiah 5. There we read an allegory of God’s relationship to the nation of Israel. God, pictured as a farmer, had cleared the hillside of debris, planted good vines, built a…