No More Learning

It is not that yon hoary lengthening beard
Ill suits the passions which belong to youth:
Love conquers age--so Hafiz hath averred,
So sings the Teian, and he sings in sooth--
But crimes that scorn the tender voice of ruth,
          all men ill, but most the man
In years, have marked him with a tiger's tooth:
Blood follows blood, and through their mortal span,
In bloodier acts conclude those who with blood began.