Two quotes from Albert Einstein - written in his 50's:

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"I am truly a 'lone traveler' and have never belonged to my country, my home, my friends (or even my immediate family) with my whole heart. In the face of all these ties, I have never lost a sense of distance and a need for solitude."

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"I live in that solitude which is painful in youth, but delicious in the years of maturity."

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