I spent years learning it, teaching it, writing about it. Then one day I stopped and realised I had never asked what Pirkei Avot actually is.

What I found changed how I understand almost everything else.

Many of us grew up with Pirkei Avot. Its teachings feel like something we have always known. If not now, when? Acquire yourself a friend. The world stands on three things. There is a warmth and familiarity to this book that is unlike anything else in Jewish life.

And that familiarity, I have come to realise, is precisely what hid the question from me.

After more than two decades as Chief Rabbi — after years of giving shiurim on this text, writing commentary, serving as general editor of an encyclopedic work on Avot — I stopped one day and found I could not answer the simplest question about it.

What is this book?

Not what does it say. What is it? The Mishnah is an elaboration of Jewish law — more than sixty tractates, each one unpacking what a Jew is obligated to do. Every single tractate deals with commandments. Except Avot. Avot contains no law, no ritual, no halakhic ruling of any kind.

So why is it in the Mishnah? Why did the greatest compiler in Jewish history put this book there, among all the laws — and why have we been reading it every Shabbos for over a thousand years without ever finding that strange?

This is the question I could not let go of. And the answer — traced through the Maharal, the Maharasha, and the Vilna Gaon, three towering minds writing centuries apart who arrived, independently, at the same conclusion — turns out to be unlike anything I had expected.

This episode is where that journey begins.

KEY QUESTIONS

· How can a book feel deeply familiar your whole life, and still contain a question you have never thought to ask?

· What does it mean that the one tractate in the Mishnah without a single law is also the one people love most?

· Is there something Avot has been doing all along that we never had a name for?

· What would it mean to discover, after decades of learning, that you had never quite asked the right question about a text you thought you knew?

· If the greatest minds in Jewish thought all arrived at the same unexpected answer about Avot - what is it that they saw?