Yes, Sedley, you are correct with your reference to the Bible. (Who directed you to that? LOL) Here is the old proverb that is the origin of my quote:
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.)