三折肱为良医

1. • break one's arm three times to become a good doctor (idiom)

     lit.

2. • experience is a good teacher

     fig.

Character by character

• 三(sān)surname San
• 折(zhé)break
• 肱(gōng)upper arm
• 为(wéi)as (in the capacity of)
• 良(liáng)good
• 医(yī)medical