lit. to search for the mule while riding on it (idiom) / fig. to look for what one already has
是骡子是马，牵出来遛遛
shì luó zi shì mǎ , qiān chū lai liù liu
lit. to see whether it's a mule or a horse, take it out for a walk (idiom) / fig. the proof of the pudding is in the eating / to show what one is made of
kè