Read as instruction, the quote suggests a repeatable method: start each session by producing one sentence you believe. Not the cleverest line, but the truest—about the scene, the character, or your own uncertainty about what comes next.
After that, the rest can be built with patience. Even if the draft later changes, the practice trains a reliable compass: when stuck, return to what is honest. Dostoevsky implies that books are not primarily born from grand plans, but from a chain reaction set off by a single moment of truth. [...]