众心如城

Explanation: One mind, like a solid wall as indestructible. Analogy united forces extremely powerful. 　　Source: "Singer of the song" the public mind into the city, Zhongkoushuojin. " 　　Examples: Hongshi both the far, faint doubts are broken, so ~, the giver into the city. ★ Tangdu Gu and "Hong Zhou Ming Da Yun Temple Bell"