千虑一得

qiān lǜ yī dé

a thousand tries leads to one success (idiom, humble expr.); Even without any notable ability on my part, I may still get it right sometimes by good luck.

千

qiān

used in 鞦韆|秋千[qiu1 qian1]

虑

lǜ

to think over

一

yī

one

得

dé

to obtain