Is there a term I can use to refer to this quote from a poem?
Solution 1:
The term mantra is a possibility.
From Vocabulary.com
mantra
A mantra is a motivating chant, like the “I think I can, I think I can” you repeat over and over to yourself on the last stretch of every marathon you run.
A mantra is usually any repeated word or phrase, but it can also refer more specifically to a word repeated in meditation.
The broadened usage, according to Wikipedia, includes
Definition There is no generally accepted definition of mantra.
- Renou has defined mantra as a thought ...
The religious overtone may not be exactly what is required.