Yiddish: What a fishing rod is to fish, flattery is to kings.

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.

‎וואָס אַ ווענטקע פֿאַר פֿיש איז חניפֿה פֿאַר מלכים.

Vos a ventke far fish iz khnife far mlokhim.

What a fishing rod is to fish, flattery is to kings.