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1 " The great sage Thales once put the general matter succinctly " Oh master," he was asked, " what is the most difficult thing to do?" " To know thyself" , he replied. " And the easiest?" " To give advice to others. "
2 " We will know which stars to visit. Our descendants will then skim the light years, the children of Thales and Aristarchus, Leonardo and Einstein. "
― Carl Sagan , Cosmos
