In this sermon, the preacher draws parallels between the sinful state of Israel in Isaiah chapter 1 and the current condition of Britain. He emphasizes the need for repentance and cleansing, urging the people to turn away from their evil ways. The preacher references the Prophet Joel's response to a similar situation in his own time, calling for weeping, mourning, and whole-heartedness in seeking God's forgiveness. The sermon emphasizes the urgency of the situation and the need for genuine repentance in order to avoid the judgment of God.