From Thomas Wentworth Higginson's 1891 Atlantic article on Emily Dickinson:
At last, after many postponements, on August 16, 1870, I found myself face to face with my hitherto unseen correspondent. It was at her father's house, one of those large, square, brick mansions so familiar in our older New England towns, surrounded by trees and blossoming shrubs without, and within exquisitely neat, cool, spacious, and fragrant with flowers. After a little delay, I heard an extremely faint and pattering footstep like that of a child, in the hall, and in glided, almost noiselessly, a plain, shy little person, the face without a single good feature, but with eyes, as she herself said, "like the sherry the guest leaves in the glass," and with smooth bands of reddish chestnut hair.
She had a quaint and nun-like look, as if she might be a German canoness of some religious order, whose prescribed garb was white pique, with a blue net worsted shawl. She came toward me with two day-lilies, which she put in a childlike way into my hand, saying softly, under her breath, "These are my introduction," and adding, also, under her breath, in childlike fashion, "Forgive me if I am frightened; I never see strangers, and hardly know what I say." But soon she began to talk, and thenceforward continued almost constantly; pausing sometimes to beg that I would talk instead, but readily recommencing when I evaded. There was not a trace of affectation in all this; she seemed to speak absolutely for her own relief, and wholly without watching its effect on her hearer. Led on by me, she told much about her early life, in which her father was always the chief figure,--evidently a man of the old type, la vieille roche of Puritanism--a man who, as she said, read on Sunday "lonely and rigorous books;" and who had from childhood inspired her with such awe, that she never learned to tell time by the clock till she was fifteen, simply because he had tried to explain it to her when she was a little child, and she had been afraid to tell him that she did not understand, and also afraid to ask any one else lest he should hear of it. Yet she had never heard him speak a harsh word, and it needed only a glance at his photograph to see how truly the Puritan tradition was preserved in him. He did not wish his children, when little, to read anything but the Bible; and when, one day, her brother brought her home Longfellow's Kavanagh, he put it secretly under the pianoforte cover, made signs to her, and they both afterwards read it. It may have been before this, however, that a student of her father's was amazed to find that she and her brother had never heard of Lydia Maria Child, then much read, and he brought Letters from New York, and hid it in the great bush of old-fashioned tree-box beside the front door. After the first book she thought in ecstasy, "This, then, is a book, and there are more of them." But she did not find so many as she expected, for she afterwards said to me, "When I lost the use of my eyes, it was a comfort to think that there were so few real books that I could easily find one to read me all of them." Afterwards, when she regained her eyes, she read Shakespeare, and thought to herself, "Why is any other book needed?"
Here is some backstory on Higginson and Dickinson.