With sincerity, gold and stone will open

jīng chéng suǒ zhì, jīn shí wéi kāi

Explanation

Gold and stone: the most precious stone in the world Hard things are also called diamonds. The original meaning is that as long as one has sincerity and sincerity, gold and stones can be opened. It means that as long as a person has a sincere heart and a strong will, anything can be done.

Source: Han Dynasty Liu Xiang's "New Preface·Miscellaneous Things 4": "Xiong Quzi saw his sincerity, and the metal and stone opened it. How about the people's hearts?"