业精于勤

1. • mastery of study lies in diligence (idiom). You can only master a subject by assiduous study.
2. • Excellence in work is only possible with diligence.
3. • Practice makes perfect.

Character by character

• 业(yè)surname Ye
• 精(jīng)essence
• 于(yú)surname Yu
• 勤(qín)diligent