There was the weight of all his centuries on the Sather, yet a curious toughness showed through his weariness.
The toughness of the Sather grew from the strength his father had given him.
mnli hypothesis: The toughness of the Sather grew from the strength his father had given him. premise: There was the weight of all his centuries on the Sather, yet a curious toughness showed through his weariness.