Difficulties are necessarily encountered (even where belief in God’s existence and ‘having a faith’ are accepted) (as described in Chapters 2 and 3), if we are to relate to God and to live a distinctively religious life, since it would be necessary to know not only that God exists but also ‘as what’ he exists. Was Aquinas correct in saying that we can know rationally that there is a God but not what God is? Does such knowledge (essential for a religious form of life and religious formation) depend therefore not on reason alone but also on revelation – a further concept which requires explanation?