“That was when the world wasn't so big and I could see everywhere. It was when my father was a hero and not a human.”

My Heart Leaps Up When I Behold, (1802); the last three lines of this form the introductory lines of the long Ode: Intimations of Immortality from Recollections of Early Childhood begun the next day.

Source: Just Listen

From A Conversation with Clemente (aired October 8, 1972); this and other excerpts were reproduced in Roberto Clemente: The Great One https://books.google.com/books?id=03XsO25A3I8C&pg=PA5 (1998) by Bruce Markusen, p. 5
Baseball-related, <big><big>1970s</big></big>, <big>1972</big>

Not found in Twain's works, this was attributed to him in Reader's Digest (September 1939): no prior attribution known. Mark Twain’s father died when Twain was eleven years old.
Disputed
Variant: When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years.

Source: Dead to the World

The Chimney Sweeper, st. 1
1780s, Songs of Innocence (1789–1790)

Radio Days (1987).

Interview The Lantern (5 April 2001) Replying to two priests who, after a performance of his routines of "The Creation of The World" and "The Hands of Good and Evil", asked if he was religious.

www.huffingtonpost.com (September 7, 2007)
2007, 2008