Exploration really is the essence of the human spirit, and to pause, to falter, to turn our back on the quest for knowledge, is to perish.

More from Frank Borman

• A superior pilot uses his superior judgment to avoid situations which require the use of his superior skill.
• Capitalism without bankruptcy is like Christianity without hell.
• It won’t be an easy journey. It’ll be long, and arduous. But I promise you one thing: on the memory of those lying here before you, we shall find it, and Earth shall become our new home. So say we all!
• Ah, but a man's reach should exceed his grasp, or what's a heaven for?
• A journey of a thousand miles begins with a single step.
• Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.