Discuss Montresor's family's coat-of-arms motto.

From the text:

The Montresors,” I replied, “were a great and numerous family.”

“I forget your arms.”

“A huge human foot d‘or, in a field azure; the foot crushes a serpent rampant whose fangs are imbedded in the heel.”

“And the motto?”

“Nemo me impune lacessit.”