" Yí cùn guāngyīn yí cùn jīn " zhè jù shī chūzì 《 Báilùdòng èr shǒu 》.
The line 'an inch of time is an inch of gold' comes from Two Poems on White Deer Grotto.
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王贞白 studied at 白鹿洞 on Mount Lu. The first poem opens 读书不觉已春深，一寸光阴一寸金: 'deep in my books, I did not notice spring grow late; an inch of time is an inch of gold'.
