孤独患者不孤独寂寞先生不寂寞
[gū dú huàn zhĕ bù gū dú jì mò xiān shēng bù jì mò]
It's somewhat ironic. This could mean despite being diagnosed as someone who has issues with loneliness ('the patient' and 'Mr. Loneliness'), such feelings do not truly exist; it can also reflect acceptance or making peace with one’s own loneliness.