[eimrine]

Great answer! I use to write down a lot on my SICP book, that are words of stupid thoughts of mine. I think this is unhealthy, so I bought another SICP if I will need to gift or to show to somebody else, both books are in English which is also not my mother language. Second book was used and it has only highlighting, which I consider a proper annotations. No other book I consider so personal to me that I feel a needness to write in it.