yéye méi dú guò duōshao shū, dàn shēnghuó lǐ nàxiē pǔsù de zhìhuì bǐ shénme dàolǐ dōu guǎnyòng

爷爷没读过多少书，但生活里那些朴素的智慧比什么道理都管用。

Grandpa wasn't highly educated, but the simple wisdom he's picked up in life works better than any grand principle.