言今未成旧人未归
[yán jīn wèi chéng jiù rén wèi guī]
It roughly translates to: 'today's words haven't become outdated yet; the old person hasn't returned' implying that while time changes many things, there are things, like promises or memories, which have yet to change over time. It carries a note of nostalgic longing mixed with expectation or hope.