A single spark can start a prairie fire in rhyme, and the next sentence is endeavor. The sentence "A single spark can start a prairie fire and persevere" means that although the initial power may be small, like a single spark, through continuous efforts and struggle, this power can be expanded into a prairie fire and eventually burned into an unstoppable force. At the same time, we must constantly sharpen ourselves on the road ahead, go forward bravely and constantly surpass ourselves.

The word "a single spark can start a prairie fire" itself describes a tiny flame rapidly expanding into a prairie fire in a very short time. Figuratively speaking, a cause or revolution, although small in scale or limited in strength at the beginning, will eventually develop rapidly and become an irresistible force with the passage of time and continuous efforts.