Pope Francis discusses how the Church can re-examine certain customs that are no longer effective means of communicating the Gospel. He notes that while the Church has rules that were quite effective historically, they may no longer be useful for guiding people's lives today. Citing St. Thomas Aquinas and St. Augustine, he argues that Church precepts should be insisted on with moderation so as not to overburden people. The task of evangelization operates within language and circumstances, constantly seeking to communicate Gospel truth in context without compromising truth. A missionary heart is aware of human limitations and strives to do good however it can.