To keep green, then, the memory of the Exodus was for the Israelite not only to keep his gratitude to his Divine Redeemer ever fresh, but to ratify again and again his covenant with his religion.

Joseph frames the Exodus not merely as a historical recollection but as a living religious practice. “Keeping green” the memory suggests deliberate, continual renewal: ritual remembrance sustains gratitude to God as redeemer and simultaneously reaffirms Israel’s binding commitment to Judaism. The point is covenantal rather than antiquarian—memory functions as moral and spiritual maintenance. In this reading, festivals, liturgy, and education are not optional commemorations but repeated acts of ratification, turning the past into an ongoing source of identity, obligation, and faithfulness. The quote thus highlights how collective memory in Judaism is designed to produce loyalty and ethical-religious continuity across generations.