What distinguishes Austen's observation is that she's not merely urging action over idle philosophizing—she's describing how the world actually reads us, regardless of our private intentions. We may harbor noble thoughts or speak fine words, yet remain fundamentally unknown until our habits reveal who we truly are; a person might call themselves generous for years before a single check arrives. She understood something that still trips us up today: the gap between the person we believe ourselves to be and the person our repeated choices make us. Watch how someone treats a waiter they'll never see again, and you learn more than from listening to their values statement.