DEUT1744 [What do we learn from the death of Moses?] … Never lose the idealism of youth. The Torah says of Moses that at the age of 120, "his eye was undimmed and his natural energy unabated" [this verse]. I used to think that these were two complementary phrases until I realised that the first is the explanation of the second. That Moses' "eye was undimmed" means that he never lost the passion for justice that he had as a young man. It is there, as vigorous in Deuteronomy as it was in Exodus. We are as young as our ideals. Give away to cynicism and you rapidly age.