there's none so blind as those who will not see

there's none so blind as those who will not see

proverb You will never be able to make some understand or accept something if they are too stubborn or unwilling to learn or notice. You can present facts and try to reason with him all you want, but his mind is made up. There's none so blind as those who will not see. Parents like them simply won't accept that their children might need to be disciplined, and there's none so blind as those who won't see.
See also: blind, none, not, see, those, who, will
Farlex Dictionary of Idioms.

There's none so blind as those who will not see.

Prov. You cannot make someone pay attention to something that he or she does not want to notice. (Used often to upbraid someone for being unwilling to notice what you are trying call attention to.) Mother: This is the fifth time our daughter has been arrested for shoplifting. Don't you think we ought to seek some kind of help for her? Father: Our girl would never shoplift. I'm sure all those arrests were just some kind of mistake. Mother: There's none so blind as those who will not see. By October, it was obvious to everyone that Richard was coming in drunk every morning. Obvious, that is, except to his devoted secretary; there's none so blind as those who will not see.
See also: blind, none, not, see, those, who, will
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • teach a man to fish
  • a little knowledge is a dangerous thing
  • a little learning is a dangerous thing
  • it takes a village
  • village
  • best-laid plans go astray, the
  • the best-laid plans
  • the best-laid plans go astray
  • the best-laid plans of mice and men
  • a good example is the best sermon