善始善終

1. • where there's a start, there's a finish (idiom) to finish once one starts sth
2. • to carry things through
3. • I started, so I'll finish.

Character by character

• 善(shàn)good at sth
• 始(shǐ)start
• 善(shàn)good at sth
• 終(zhōng)finish