Marginalia as Conversation
I bought a second-hand copy of Montaigne's essays and found, in the margins, the handwriting of a stranger. They had underlined passages I would not have noticed, questioned assertions I had accepted, and drawn a small star next to a sentence about the impossibility of knowing oneself fully.
This stranger and I are now in conversation. We disagree about Montaigne's view of friendship (they wrote "too idealistic" where I would have written "exactly right") but we agree about his prose style (we both underlined the same passage about the inadequacy of language).
The Margin as Meeting Place
A margin is a liminal space — it belongs to the book, but it also belongs to the reader. When you write in a margin, you are adding your voice to the text. You are not defacing the book; you are completing it.
The most interesting books I own are the ones with the most marginalia. Not my own notes, which I can reconstruct from memory, but the notes of others — the evidence that someone else sat with these same words and was moved to respond.
Against Clean Pages
There is a reverence for the pristine book that I do not share. A book with unmarked pages is a book that has been looked at but not engaged with. It is a decoration, not a conversation partner.
Write in your books. Argue with them. Leave evidence of your passage. Someone will find it years from now and feel less alone in their reading.