Most people were heartless about turtles because a turtle’s heart will beat for hours after it has been cut up and butchered. But the old man thought… - Ernest Hemingway

In going where you have to go, and doing what you have to do, and seeing what you have to see, you'll dull and blunt the instrument you write with. But I would rather have it bent and dull and know I had to put it to the grindstone again and hammer it into shape and put a whetstone to it, and know that I had something to write about, than to have it bright and shining and nothing to say, or smooth and well-oiled in the closet, but unused.

To be able to say: I loved this person, we had a hell of a nice time together, it’s over but in a way it will never be over and I do know that I for sure loved this person, to be able to say that and mean it, that’s rare, señor. That’s rare and valuable.” — Ernest Hemingway, from The Complete Short Stories

Cowardice, as distinguished from panic, is almost always simply a lack of ability to suspend the functioning of the imagination.