Hekayat 59 from Chapter 8 of Golestan of Saadi

English Translation for Hekayat
A learned person should not overlook the foolishness of the ignorant with patience, for it harms both sides: the scholar's dignity diminishes, and the ignorant's folly becomes entrenched.
If you speak kindly and pleasantly with a lowly person,
Their arrogance and obstinacy increase.
متن حکایت
عالِم را نشاید که سفاهت از عامی به حلم درگذراند که هر دو طرف را زیان دارد: هیبت این کم شود و جهل آن مستحکم.
چو با سفله، گویی به لطف و خوشی
فزون گرددش کبر و گردنکشی