"Expedients are for an hour, but principles are for the ages. Just because the rains descend and winds blow, we cannot afford to build on shifting sands."

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A lot of people ask...why a man is willing to risk... Well, we've got to do it. We're going into an age of exploration that will be bigger than anything the world has ever seen... If a man faces up to the (unknown) and takes the dare of the future, he can have some control over his destiny.

— John Glenn