The document summarizes Larry Cai's experience evangelizing agile practices over 6 years. It describes 3 experiences from the past where he learned: to start small and prove value before refactoring; understand business needs and work with different people's strategies; and that what seems good may not be accepted by others. It provides 3 suggestions: pilot new technologies carefully with a technical mindset and community; fail fast and work with people to drive changes stepwise; follow changes until success or stability or cease changes. The overall message is about learning from experience to effectively introduce agile practices over time.