Kokoro, by Natsume Soseki (paragraph #784)

先生は是以外に何も答へなかつた。私も其話はそれぎりにして切り上げた。すると一町程歩いた後で、先生が不意に其所へ戻つて來た。

translation

Sensei gave no answer other than yes. I also ended the story with that. Then, after walking about a block, Sensei suddenly returned to the place.

kanji (pronunciations & definitions)
先生: teacher (せんせい), instructor, master, sensei, title or form of address for a teacher, master, doctor, lawyer, etc. 以外: with the exception of (いがい), excepting, excluding : what (なに), what (ナニ), you-know-what, you-know-what, that thing : answer (こたえ), reply, response, answer, solution
: eager (せつ), earnest, ardent, kind, keen : above (うえ), over, up, top, summit : behind (あと), rear, after, later, remainder 不意: sudden (ふい), abrupt, unexpected, unforeseen

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