Fool me once, shame on you; fool me twice, shame on me

Fool me once, shame on you; fool me twice, shame on me is a proverb. A proverb is a short, common saying or phrase that may be a famous quote, an inspirational quote, an epigram, or the topic of a parable. These common sayings are language tools or figures of speech that particularly give advice […]
from Grammarist
https://grammarist.com/proverb/fool-me-once-shame-on-you-fool-me-twice-shame-on-me/