I remember reading the Lindbergh book as a kid (it was on the bookshelf). I liked it well enough, but the tone seemed verging on the melancholic. Now that I see she was quoting the somber poet Rilke, that makes sense.
I fundamentally disagree with the premise that "we are alone" either literally or figuratively, and that there is some kind of deep truth embodied in the statement. . If you take that notion on the authority of a poet you're in logical trouble. The evidence isn't supportive of the premise. Social animals seek out each other's company. To the extent that people distract themselves from meaningful social interaction with gadgetry and gimmicks, well, so much the worse for them. There are more people alive now than at any time in human history. We now know that non-human cells outnumber human cells in the body by a ratio of 10:1. No, we are not alone, not even among the cells of our bodies, but we can learn to become comfortable with the fruits of solitude through mindful living.
This is not inherently difficult to do if you simply make the time and simply pay attention. It may be boring at times, but that is hardly important. Perhaps what people really fear is boredom. But fear of boredom is hardly a poetic sentiment!
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