Meaning of the word "there are none so blind as those who will not see" in English

What does "there are none so blind as those who will not see" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

there are none so blind as those who will not see

US /ðɛr ɑːr nʌn soʊ blaɪnd æz ðoʊz huː wɪl nɑːt siː/
UK /ðɛə r ɑː nʌn səʊ blaɪnd æz ðəʊz huː wɪl nɒt siː/
"there are none so blind as those who will not see" picture

Idiom

it is impossible to help or convince someone who refuses to acknowledge the truth or learn from the facts

Example:
I tried to show him the evidence of the scam, but there are none so blind as those who will not see.
She refuses to believe her son is lying; there are none so blind as those who will not see.