What philosopher said there are none so blind as those who refuse to see?

"There are none so blind as those who will not see. The most deluded people are those who choose to ignore what they already know."

These saying has it roots in the Bible:

"Hear now this, O foolish people, and without understanding; which have eyes, and see not; which have ears, and hear not."(Jer. 5:21, King James version)

First to use it in literature was Jonathan Swift, who wrote it in 'Polite Conversation' (1738).