Kokoro, by Natsume Soseki (paragraph #949)

先生は庭の方を向いて、澄まして烟草を吹かしてゐた。相手は自然奧さんでなければならなかつた。

translation

Sensei turned to the garden and quietly smoked. The other party had to be a natural wife.

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. : garden (にわ), yard, courtyard, field (of action), area : direction (かた), way, person, lady, gentleman 烟草: tobacco (えんそう), tobacco (たばこ), tobacco (タバコ), cigarette, cigarette
自然: nature (しぜん), natural, spontaneous, automatic, naturally : inner part (おく), interior, back (of a drawer, one’s throat, etc.), depths (e.g. of a forest), recesses (e.g. of a cave)

Next paragraph