Plutarch: Solon, Aesop, kings — rare vs pleasing

Now it so happened that Aesop, the writer of fables, was in Sardis, having been summoned thither by Croesus, and receiving much honor at his hands.

He was distressed that Solon met with no kindly treatment, and said to him by way of advice: ‘0 Solon, our converse with kings should be either as rare, or as pleasing as is possible.’

‘No, indeed.’ said Solon, ‘but either as rare or as beneficial as is possible.’

— https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0063%3Achapter%3D28