Read the passage. (1) While editing the family cookbook, Soren resented his father's notes in the margins of his mother's recipes: "less salt," "stir twice," "ask me the next step." (2) He read them as evidence that Father had corrected her even in the kitchen. (3) In a drawer he found a card in Mother's hand: "When the words begin leaving me, write the path back beside them." (4) Later notes changed from commands to questions: "Which spoon did we use?" and "Tell me the smell." (5) Soren saw two handwritings building a bridge in opposite directions. What does Soren come to understand about the marginal notes?