Huíxiǎng dāngnián qiǎng shuō chóu de rìzi, zhēnshì shàoniánbùshíchóuzīwèi.
Looking back on those days of forced melancholy - truly, the young don't know what real sorrow tastes like.
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From Xin Qiji's Southern-Song ci 《丑奴儿·书博山道中壁》: 少年不识愁滋味，爱上层楼…而今识尽愁滋味，欲说还休. After setbacks in his career the poet looks back on a youth that forced melancholy just to write fine verse, contrasting it with a now-real sorrow he can no longer put into words.
usage
The 识 is read shí ('to know / recognize'), not zhì. The line is usually quoted against its sequel 而今识尽愁滋味 to capture the gap between carefree youth and a life that has tasted real grief.
