To establish the grounds of Christian faith, Rahner asserts that two points should be proven as historically credible—first, that Jesus saw himself "as the eschatological prophet, as the absolute and definitive saviour", and second, that the resurrection of Jesus is the absolute self-communication of God. There are several historical elements concerning Jesus' identity as a Jew and "radical reformer": his drastic behaviour in solidarity with social and religious outcasts based on his belief in God, his essential preaching "as a call to conversion", his gathering disciples, his hope for conversions of others, his acceptance of death on the cross "as the inevitable consequence of fidelity to his mission".