According to the following paragraph what is the difference between the first " that" and the second "that" grammatically? Do they have the same meaning?
Artists tell me that for a deep and true appreciation of art one must educate the eye. One must learn from experience to weigh the merits of line, of composition, of form and color. If I had eyes, how happily would I embark upon so fascinating a study! Yet I am told that, to many of you who have eyes to see, the world of art is a dark night, unexplored and unilluminated."
Three Days to See, by Helen Keller