—Still it’s solid food, his good genius urged, I’m a stickler for solid food, his one and only reason being not gormandising in the least but regular meals as the sine qua non for any kind of proper work, mental or manual.
In the nature of single blessedness he would one day take unto himself a wife when Miss Right came on the scene but in the interim ladies’ society was a conditio sine qua non though he had the gravest possible doubts, not that he wanted in the smallest to pump Stephen about Miss Ferguson (who was very possibly the particular lodestar who brought him down to Irishtown so early in the morning), as to whether he would find much satisfaction basking in the boy and girl courtship idea and…
There are no more uses of "sine qua non" in the book.
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It was as though he knew very well that in Lombard’s past actions legality had not always been a sine qua non….
Agatha Christie -- And Then There Were None
Simple facts in isolation, and facts to connect them—ands and buts—are the sine qua non of all their glorious achievement.