
A Single Spark Can Start A Prairie Fire https://www.marxists.org/reference/archive/mao/selected-works/volume-1/mswv1_6.htm (1930)
He later wrote the similar quote "When guerrillas engage a stronger enemy, they withdraw when he advances; harass him when he stops; strike him when he is weary; pursue him when he withdraws." On Guerrilla Warfare https://www.marxists.org/reference/archive/mao/works/1937/guerrilla-warfare/ch01.htm (1937), Chapter 1 - "What Is Guerrilla Warfare?"