What is origin of there's none so deaf as those who will not hear?

The phrase "there's none so deaf as those who will not hear" suggests that people can be willfully ignorant or resistant to acknowledging truths or information that contradict their beliefs. Its origin can be traced back to the biblical proverb in Matthew 13:15, which discusses the spiritual blindness and deafness of those unwilling to accept the truth. Over time, this sentiment has been adapted into common usage to highlight the idea that some individuals choose to ignore reality despite clear evidence.