"It is true that we were cautious in our planning. There were many uncertainties about how well our Lunar module systems and our Pressure suit and backpack would match the engineering predictions in the hostile lunar environment. We were operating in a near perfect vacuum with the temperature well above 200 degrees Fahrenheit with the local gravity only one sixth that of Earth. That combination cannot be duplicated here on Earth, but we tried as best we could to test our equipment for those conditions. For example, because normal air conditioning is inadequate for lunar conditions, we were required to use cold water to cool the interior of our suits. We did not have any data to tell us how long the small water tank in our backpacks would suffice. NASA officials limited our surface working time to 2 and 3/4 hours on that first surface exploration to assure that we would not expire of hyperthermia."

“Neil Armstrong Air and Space Museum”

“I guess we all like to be recognized not for one piece of fireworks but for the ledger of our daily work.”

“I think we're going to the moon because it's in the nature of the human being to face challenges. It's by the nature of his deep inner soul ... we're required to do these things just as salmon swim upstream.”

“A century hence, 2000 may be viewed as quite a primitive period in human history. It's something to hope for. ... I am, and ever will be, a white-socks, pocket-protector, nerdy engineer — born under the second law of thermodynamics, steeped in the steam tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow. As an engineer, I take a substantial amount of pride in the accomplishments of my profession.”

“The exciting part for me, as a pilot, was the landing on the moon. That was the time that we had achieved the national goal of putting Americans on the moon. The landing approach was, by far, the most difficult and challenging part of the flight. Walking on the lunar surface was very interesting, but it was something we looked on as reasonably safe and predictable. So the feeling of elation accompanied the landing rather than the walking.”

“Our autopilot was taking us into a very large crater, about the size of a big football stadium with steep slopes on the crater covered with very large rocks about the size of automobiles that was not the kind of place that I wanted to try to make the first landing.”