Final answer:
The figurative language used in the quote is personification, where ingratitude is personified as stronger than a traitor's arms.
Step-by-step explanation:
The figurative language used in the quote is personification.
Personification is a figure of speech in which inanimate objects or abstract ideas are given human qualities or characteristics.
In the quote, the idea of ingratitude is personified as being stronger than a traitor's arms. This means that ingratitude has been given the human trait of strength, and it is depicted as being more powerful and victorious than the physical weapons of a traitor.