There is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.
Immanuel KantHuman reason has this peculiar fate that in one species of its knowledge it is burdened by questions which, as prescribed by the very nature of reason itself, it is not able to ignore, but which, as transcending all its powers, it is also not able to answer.
Immanuel Kant