Quotes from book
Rocket Ship Galileo

Name: Rocket Ship Galileo
Author: Robert A. Heinlein

Rocket Ship Galileo is a juvenile science fiction novel by American writer Robert A. Heinlein, published in 1947, about three teenagers who participate in a pioneering flight to the Moon. It was the first in the Heinlein juveniles, a long and successful series of science fiction novels published by Scribner's. The novel was originally envisioned as the first of a series of books called "Young Rocket Engineers". It was initially rejected by publishers, because going to the moon was "too far out".

“I was just trying to show you,” he went on, “just how insubstantial a ‘common sense’ idea can be when you pin it down. Neither ‘common sense’ nor ‘logic’ can prove anything. Proof comes from experiment, or to put it another way, from experience, and from nothing else.”

Robert A. Heinlein book Rocket Ship Galileo

Source: Rocket Ship Galileo (1947), Chapter 10, “The Method of Science”, p. 105

““You know the answers, but just between ourselves, that sketch smells a bit. It’s sloppy.”
“I never did have any artistic talent,” Art said defensively. “I’d rather take a photograph any day.”
“You’ve taken too many photographs, maybe. As for artistic talent, I haven’t any either, but I learned to sketch. Look, Art—the rest of you guys get this, too—if you can’t sketch, you can’t see. If you really see what you’re looking at, you can put it down on paper, accurately. If you really remember what you have looked at, you can sketch it accurately from memory.”
“But the lines don’t go where I intend them to.”
“A pencil will go where you push it. It hasn’t any life of its own. The answer is practice and more practice and thinking about what you are looking at. All of you lugs want to be scientists. Well, the ability to sketch accurately is as necessary to a scientist as his slipstick. More necessary, you can get along without a slide rule.””

Robert A. Heinlein book Rocket Ship Galileo

Source: Rocket Ship Galileo (1947), Chapter 10, “The Method of Science”, p. 108

“Hans had courage to burn. If he had been willing to knuckle under to the Nazis he would have stayed at Kaiser Wilhelm Institute. But Hans was a scientist. He wouldn’t trim his notion of truth to fit political gangsters.”

Robert A. Heinlein book Rocket Ship Galileo

Source: Rocket Ship Galileo (1947), Chapter 4, “The Blood of Pioneers”, p. 34