The following are some of the famous sayings about unity:

1. If you can use the strength of all people, you will be invincible in the world; if you can use the wisdom of all people, you will have no fear of the saints.

2. Five people unite to form a tiger, ten people unite to form a dragon, and a hundred people unite to resemble Mount Tai.

3. People can do things together that one person cannot do alone; the combination of wisdom + hands + strength is almost omnipotent.

4. Unity brings strength and wisdom. Without sincerity or insufficient equality, there can be no lasting and sincere unity.

5. An individual is weak, just like Robinson Crusoe. Only when he is with others can he accomplish many things.

6. A common cause and a common struggle can give people the power to endure everything.

7. When people unite, Mount Tai will move.

8. Unanimity is powerful, but disputes are easy to conquer.

9. Without unity, any force will be weak.

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"Unity is Strength" is a song written by Mu Hong and composed by Lu Su. It was composed in June 1943. On August 26, 2015, the song was selected into the online voting list of "My Top Ten Favorite Anti-Japanese War Songs" by the State Administration of Press, Publication, Radio, Film and Television of the People's Republic of China.

In 1942, Chairman Mao advocated in his "Speech at the Yan'an Forum on Literature and Art" that literary and art workers should go deeper into life and reflect life. The Northwest Field Service Corps where Mu Hong and Lu Su belonged also organized small teams to go deep into the vast rural areas of Pingshan, Hebei and Fanzhi, Shanxi to participate in the struggle.

In 1943, the Japanese invaders implemented the policy of "rob, kill, and burn" the Shanxi-Chahar-Hebei border region. At that time, the anti-Japanese base areas behind enemy lines were in "darkness before dawn."

After the service team arrived in Pingshan, they lived with the people day and night. They not only organized the masses to help themselves through production, led farmers to carry out rent and interest reduction campaigns, but also went into the countryside to perform and promote. The actions and courage of the peasants to fight for their legal rights touched these literary and artistic workers.

In order to reflect the situation at that time, Mu Hong and Lu Su wrote a small opera "Unity is Strength". After the plot of the opera was finalized, everyone felt that the ending was a bit sudden and lacked a sense of ending. Based on everyone's suggestions, it was decided that Comrade Mu Hong would write the lyrics and Comrade Lu Su would compose the music, adding a final act to the play, and "Unity Is Strength" was born.

Another background to the creation of this song is that as the War of Resistance Against Japan entered the most difficult stage of stalemate, a countercurrent of passive resistance to the war emerged in society.

Mu Hong and Lu Su realized the necessity of all forces in society to unite to resist Japan. Only by uniting to form a steely force can they be invincible, so they created this song