From the Book of Songs poem 《
蒹葭》:
蒹葭苍苍，
白露为霜。
所谓伊人，
在水一方 (The reeds are green, the white dew turns to frost. The one I long for is somewhere across the water). The last line gave
琼瑶's novel and song 《
在水一方》 its title.
伊 is an old literary pronoun for 'that one, he or she'.
