I Love My Wife, My Wife Is Dead (1946) (bingqiangao.com)

"For small creatures such as we, the vastness is bearable only through love"

Important context is that he cheated on this woman with every warm body he could find

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I wonder how many husbands and wives wrote letters like this in August of 1945.

He was brilliant in physics, not physical relationships. He married his fourth wife because he had a dream with a pool table where he couldn't score a ball for goodness' sake.