Red and Blue

Can a blind man see?

How many times must a blind man feel a red thing and a blue thing to learn to tell what is red and what is blue?

But one who sees, does not need to feel anything red or blue to know what is red and blue. Feel is irrelevant to knowing colours.

And he does not even need to see what is maroon or mauve or magenta, but just from someone's description of these, he may already be able to recognise them the first time, if he ever sees these colours.

But a blind man will go to his grave not knowing what is red or blue.

And worst he thinks he knows, and has learnt what is red and what is blue.

But the wise blind man knows that he cannot know and will not seek in futility to tell what is red and what is blue.