Anyone whose pocket is full of gold
Whatever nonsense he says is respected
The one whose pockets are empty
Even if their speech is golden, he is treated like an idiot

(Old farsi/persian poem source unknown)

هرآنکس که جیبش پر از زَر بوَد
کلامش متین است اگر خَر بوَد
هرآنکس که جیبش تهی‌از زَر است
اگر از دهان دُر ببارد خر است