Carlo Rovelli

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Rosh HaShanah: The Beginning of Change II

Abstract This essay explores the profound connections between language, philosophy, physics, and spirituality in the context of Rosh HaShanah. By examining the linguistic roots of “shanah” (year), “shinui” (change), and “shnei” (two), the essay uncovers a rich tapestry of meaning that addresses the fundamental question: Why is there change rather than permanence? The study traces the metaphysical concept of change from ancient Greek philosophy through medieval Jewish thought to modern physics, highlighting the paradoxical relationship between the Infinite Creator and finite creation as expressed in Kabbalistic and Chassidic concepts of mati ve’lo mati and ratzo va’shov. The essay concludes by proposing a relational view of time and change, aligning Jewish mystical thought with contemporary physics, and presenting Rosh HaShanah as an opportunity for renewing and deepening our relationship with the Divine. Introduction In [...]

Wigner’s Friend Receives a Death Threat

It is related that on the day that Rabbi Yehuda HaNasi died, the Sages decreed a fast, and begged for divine mercy so that he would not die. And they said: Anyone who says that Rabbi Yehuda HaNasi has died will be stabbed with a sword. (Talmud, tr. Ketubot 104a)   We find an interesting example of the Wigner’s Friend paradox in the Gemara quoted above. The Gemara discusses the circumstances surrounding the death of Rabbi Yehuda HaNasi (Juda the Prince, knows simply as the Rebbi), one of the greatest sages of Israel, who compiled Oral Torah in the Mishnah. Why did the Sages issued a death threat to “anyone who says that Rabbi has died” promising that he “will be stabbed with a sword”? The medieval Talmudist Rabbi Bezalel Ashkenazi (1520-1592), in [...]

Relational Space

Meditations on the Maaseh Merkavah – II This post is a sequel to my previous post, “Space – Between Future and Past.” For background information, the reader is referred to that post. My second Shavuot “epiphany” was that space is relational. Not that I realized that space was relational for the first time – I always thought so. But, for some reason, thinking about the meaning of the four faces of Chayot, the "living creatures" – the angelic beings described in the prophecy of Ezekiel that we read on Shavuot – made it absolutely clear in my mind. Isaac Newton The debate about the nature of space goes back at least to the times of Newton and Leibniz. Isaac Newton believed (as it is apparent from his mechanics and as it [...]

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