自为过客岂敢奢求挂你心
[zì wéi guò kè qĭ găn shē qiú guà nĭ xīn]
This suggests a transient, non-intrusive mindset: 'As a passerby, I wouldn't dare expect to occupy your heart'. It conveys an emotion of humility and acceptance in an unreciprocated love or affection.