When can a single spark start a prairie fire?

During the agrarian revolution, a single spark can start a prairie fire.

A single spark can start a prairie fire. This is a letter from Mao Zedong to Lin Biao on 1930. In reply to Lin Biao, I sent a letter asking for advice on how to estimate the future of the Red Army.

In this letter, Mao Zedong criticized Lin Biao and some comrades in the Party for their pessimistic views on the current situation.

1948, Lin Biao proposed to the Central Committee that his name should not be mentioned when this letter was published publicly. Mao Zedong agrees with this opinion. When included in the first edition of this book, the letter was changed to "A single spark can start a prairie fire", and the place where Lin Biao was criticized by name was modified.