life and death, blessing and cursing: This pairing of words shows a close connection. Life is connected to blessing, and death is connected to curse.
In this passage, blessing does not only bring life. Blessing is life itself. It is life in the land, safety, and God’s favor.
In the same way, curse does not only bring death. Curse is death itself. It is loss of the land, suffering, and separation from God’s favor.