The next seven years will be a period of great prosperity throughout the land of Egypt.
The seven healthy cows and the seven healthy heads of grain both represent seven years of prosperity.
But afterward there will be seven years of famine so great that all the prosperity will be forgotten in Egypt. Famine will destroy the land.
He piled up huge amounts of grain like sand on the seashore. Finally, he stopped keeping records because there was too much to measure.