What lines does Beowulf remark on the passing of the Heroic Era?

In the epic poem Beowulf, the passing of the Heroic Era is remarked by Beowulf himself in the following lines:

"Lo, the spear-Danes' glory through sword-drifts thickens, / fierce the fate that hangs over their heads; / through the dark night I’ve watched the wrath of man / bouncing between father and son as it consumes them both." (Lines 901-904)

These lines reflect Beowulf's contemplation on the decline of the heroic age and the inevitable destruction caused by the cycle of violence and feuds between fathers and sons.