To be human is to ask questions. Some questions emerge from the very particularity of the context in which we live; others are lasting questions that we cannot escape because they shape our own identity. Peter's Catechism is an invitation for Christians to revisit three questions that Jesus asked the apostle Peter in the Scriptures: Who do you say that I am? Why did you doubt? Do you love me? All three questions are simultaneously particular and lasting: particular because they demand a personal answer from us in the here and now of our existences; lasting because they point to the heart of what it means to be Christian.