Spiritual realization is theoretically the easiest thing and in practice the most difficult thing there is. It is the easiest because it is enough to think of God. It is the most difficult because human nature is forgetfulness of God.
When people want to be rid of Heaven it is logical to start by creating an atmosphere in which spiritual things appear out of place; in order to be able to declare successfully that God is unreal they have to construct around man a false reality, a reality that is inevitably inhuman because only the inhuman can exclude God. What is involved is a falsification of the imagination and so its destruction.
