[ bù jīng yī shì，bù zhǎng yī zhì ]

智：智慧，见识。不经历一件事情，就不能增长对那件事情的见识。

宋·悟明禅师《联灯会要·道本禅师》:“老赵州十八上便解破家散宅，徒为戏论，虽然如是，不因一事，不长一智。”

You can't gain knowledge without practical experience (idiom); wisdom only comes with experience