Who said "To be intelligent, one must be humble."?

This quote is attributed to Sophocles.

To be intelligent, one must be humble. - Sophocles

"To be intelligent, one must be humble."

Sophocles

Tragic Playwright Ancient Greece 496–406

"Wisdom brings suffering to those who possess it."

"Nobody likes the man who brings bad news."

"All that is and will be comes forth from necessity."

"To the man who is afraid everything rustles."