陰陽師身の上知らず（おんようじみのうえしらず）

Japanese vocabulary

Meaning: people don't know themselves as well as they know others; even if you know what will happen to others, you don't know what will happen to yourself; a fortune teller can't tell their own future

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “陰陽師身の上知らず” pronounced in real videos (YouGlish)