Poems of Meng Jiao
Perfect white won't make black darker.
Perfect friendship knows when it is weak.
In human life, calm and rash are different.
Don't despise each other's guidance.
Glue and laquer last through wars.
True friendship cultivates our thought.
The admiration of heartless men
Is not worth honesty and virtue entwined.
If all Tang poets have their Chu Kingdom poems, they also have their moral homilies. Like this one. I'm guessing, from the second and third meanings of some of these characters, that this is something of an apology poem, or a making-up poem, from Meng Jiao to Han Yu. From the supposed time-period within the scrolls, Meng Jiao and Han Yu are just now passing their exams and are still very different men for such close friendship. There's a kind of Confucian vagueness (the vagueness of dogmatic adherents, not of Kongzi) to this poem that allows its intended recipient to nod sagely and accept an apology, without anything actually being said or apologised for. Just what two stubborn and opinionated close friends need. The requirement of a specific apology with admission of error might have been the end of it all.