In his sermons, Answer to Faustus a Manichean, and other works, Augustine insisted that belief in Christ's resurrection establishes the identity and defines the faith of Christians. In justifying resurrection belief, he appealed to evidence from (1) created nature and (2) human history, and to (3) the desires and experiences of those he addressed. From the perspective of creation, ‘the miracle’ of the world and all the wonders it contains (particularly the worldly pattern of ‘new life after death’) support Easter faith. Historically, Augustine argues from a visible effect (almost the whole of Roman society accepting the resurrection) to the only adequate cause of this phenomenon (Christ's victory over death). Finally, the human hunger for happiness, Augustine argues, finds its fulfilment only through sharing in Christ's resurrection – though in this context he does not forget the light provided by the Holy Spirit, through whom ‘with the eyes of the heart we behold’ the risen Christ (Sermon 263).