“Living is not an art, but to write of life is. Life is a series of accidents and anticlimaxes, misremembered and misunderstood, with lessons only dimly learned. Life is disorganized, lacks shape, lacks story.”
In “The Affirmation” by Christopher Priest
A Priest book isn't just a (SF) book. It is the distilled essence of a philosophy, a memoir; a piece of someone's soul. Losing the book is losing that element. On a more mundane level, it is also a memory - I read a book when I was about 7 (a proto-choose-your-own-adventure thing) that I've fitfully searched for ever since and never found, and doing so would put me right back on my nan's sofa on a Saturday afternoon with the wrestling on.
If you're into stuff like this, you can read the full review.