明知无人回顾谁能初心不负
[míng zhī wú rén huí gù shéi néng chū xīn bù fù]
'Knowing No One Looks Back Who Can Keep Their Initial Heart.' It conveys a mix of realism, disillusionment, yet determination. The individual knows it's difficult in life to stay sincere or true-hearted, but they are resolved to uphold their original intentions even if no one acknowledges it.