This unsourced sentence from Wikipedia is, I think, fantastic.
With the completion of the Tractatus Wittgenstein believed he had solved all the problems of philosophy and he abandoned his studies, working as a schoolteacher, a gardener at a monastery, and as an architect, along with Paul Engelmann, on his sister’s new house in Vienna.
— “Ludwig Wittgenstein“, Wikipedia, Retrieved July 6, 2009.
I’ve heard people say that Wittgenstein was the greatest philosopher of the 20th century. Now I know why. If I end up going into philosophy, this is what I want my career summary to be too. Publish one book, solve all the problems in the field, and then do some gardening.
Sure, Wittgenstein did come back to philosophy later and renounced much of his previous work, but for a while there he really knew what he was doing.