Giussani begins by focusing on the Church as a community composed of people who are aware of themselves as defined by the gift of the Spirit, from which they derive a new conception of existence, the fruit of conversion.
He then describes the Church's developing self-awareness of its dual elements of the human and divine.
Concerned with verifying the Church's claim to embody Christ, Giussani situates the locus of verification in human experience, arguing that a different type of life is born in those who try to live the life of the Church. Why the Church? is a seminal study that will engage both the scholar and the general reader.