After using the power of habit to convert people to his church, Warren next started using it to spread his church’s teachings more effectively. Of course, Warren’s purpose was also to teach his followers new habits—like Duhigg, he thinks that good habits are the key to living a good life. Like Alcoholics Anonymous groups, Warren’s weekly Bible study groups sought to give people a consistent, safe, personalized environment for forming these new habits. Meanwhile, Warren’s large weekly services reinforced the weak ties that connected his whole congregation together.