Gharan Shows Tur's Signet at the Gate

From A6.23, Gharan Takes the Castle of the Alanons. It illustrates A6.23.30–35:

A6.23.30
The castellan heard Gharan’s message through,And saw the signet-ring and deemed it true.
A6.23.31
At once the fortress gate was opened wide;He saw what showed, but not what lay inside.
A6.23.32
Now hear the speaking dehqan’s warning art:He reads another who conceals his heart.
A6.23.33
Let service be the calling we pursue,But thought must walk beside whatever we do.
A6.23.34
In good or ill, whatever comes to pass,Take counsel from the tales of ages past.
A6.23.35
The castellan with Gharan climbed the wall;The battle-seeking chief observed it all.