A thousand times I search for her in the crowd
And, suddenly turning my head,
Discover her where the lantern lights are dim.

众里寻他千百度，蓦然回首，那人却在，灯火阑珊处。

Original text (Chinese)

Notes from Wikiquote

In Poetry and Prose of the Tang and Song, trans. Yang Xianyi and Gladys Yang (Alma Classics, 1984), p. 300