Kenny, a philosopher by profession, struggles with the intellectual problems of theism and the possibility of believing in god, especially in an intellectual climate dominated by Logical Positivism.

Here he revisits the Five Ways of Aquinas and argues that they are not so much proofs as definitions of God. He is also in constant dialogue with Wittgenstein for, Kenny writes, no man in recent years has surpassed him in devotion of sharp intelligence to the demarcation of the boundary between sense and nonsense.