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I reasoned as follows: abstract concepts like "antonym" didn't work as an answer—which means it must be something concrete.
Then I remembered Derzhavin's "I am a slave, I am a tsar, I am a worm, I am God"—and I guessed it :)
And in principle, all these pairs of contradictions can indeed be applied to a person or humanity (except for "lighter than a feather," where things are different—one must consider that riddles of this type were most likely composed before the mid-twentieth century, and while the idea of the soul was shared by few at the time, it was known to everyone and resided, so to speak, in "working memory"—it was always ready to "jump" into the mind—so this refers specifically to the soul).
And generally, everything we can conceive, we can only conceive through ourselves... so in principle, all our thoughts and everything we invent bear an indelible imprint of a human being...