Who said "To produce a mighty book, you must choose a mighty theme"?

This quote is attributed to Ishmael.

To produce a mighty book, you must choose a mighty theme - Ishmael

"To produce a mighty book, you must choose a mighty theme"

Ishmael Literature

Character in Moby-Dick

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"Call me Ishmael."

"Some certain significance lurks in all things, else all things are little worth."

"It is the whale's intrinsic nature to be wondrous."

"Better to sleep with a sober cannibal than a drunken Christian."

"The pen is mightier than the sword."

"Literature opens the mind to new worlds"

"The interesting thing about books is that they're made of words."

"Literature captures the essence of what it means to be human."