If a writer of prose knows ...

If a writer of prose knows enough about what he is writing about he may omit things that he knows and the reader, if the writer is writing truly enough, will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A writer who omits things because he does not know them only makes hollow places in his writing.
If a writer of prose knows enough about what he is writing about he may omit things that he knows and the reader, if the writer is writing truly enough, will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A writer who omits things because he does not know them only makes hollow places in his writing.
 Ernest Hemingway

Quotes from the same author

Never mistake motion for action.
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 Ernest Hemingway
But man is not made for defeat. A man can be destroyed but not defeated.
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 Ernest Hemingway
I used to play cello. My mother kept me out of school a whole year to study music and counterpoint. She thought I had ability, but I was absolutely without talent.
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 Ernest Hemingway
Cowardice, as distinguished from panic, is almost always simply a lack of ability to suspend the functioning of the imagination. Learning to suspend your imagination and live completely in the very second of the present with no before and no after is the greatest gift a soldier can acquire.
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 Ernest Hemingway
Worry destroys the ability to write. Ill health is bad in the ratio that it produces worry which attacks your subconscious and destroys your reserves.
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 Ernest Hemingway