一寸光阴一寸金，寸金难买寸光阴

yī cùn guāng yīn yī cùn jīn , cùn jīn nán mǎi cùn guāng yīnyicunguangyinyicunjin,cunjinnanmaicunguangyin

1. (lit.) an interval of time is worth an ounce of gold, money cannot buy you time (saying)
2. (fig.) time is precious

Study it in Yanamino