As long as he crawled

Well he knew that in love, man must give, must let himself be fooled and that the only way to approach a woman was on all fours. And he had crawled at intervals, and as long as he crawled everything had gone well, but when he had finally straightened up, that was the end of it, always with a multitude of reproaches that he had been false, that he had dissembled submission, that he had never loved, and so on.

August Strindberg - On the Seaboard (1890)