“I should have liked to produce a good book. This has not come about, but the time is past in which I could improve it.” (Preface to Philosophical Investigations)
The preface is actually very fun to read. Very honest, quite cynical, too.
>"[...] mainly because I was obliged to learn that my results (which I had communicated in lectures, typescripts and discussions), variously misunderstood, more or less mangled or watered down, were in circulation. This stung my vanity and I had difficulty in quieting it."