“Happiness must be cultivated. It is like character. It is not a thing to be safely let alone for a moment, or it will run to weeds.”
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Solitude is strength to depend on the presence of the crowd is weakness. The man who needs a mob to nerve him is much more alone than he imagines.
He never is alone that is accompanied with noble thoughts.
Nobody was playing the soprano saxophone and certainly nobody was trying to do anything with it. So I was all alone. I didn't know that at first.
Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years.