When a sage comes in contact with fools, he must not expect to be honoured, and if an ignorant man overcomes a sage in an oratorical contest, it is no wonder, because even a stone breaks a jewel.
What wonder is there that the song
Of a nightingale ceases when imprisoned with a crow
Or that a virtuous man under the tyranny of vagabonds
Feels affliction in his heart and is irate.
Although a base stone may break a golden vase,
The price of the stone is not enhanced nor of the gold lost.
Saadi Shirazi
http://www.poemhunter.com/poem/ch-08-on-rules-for-conduct-in-life-maxim-34/
