William Peter Blatty said this quote

We mourn the blossoms of May because they are to whither; but we know that May is one day to have its revenge upon November, by the revolution of that solemn circle which never stops---which teaches us in our height of hope, ever to be sober, and in our depth of desolation, never to despair.

~ William Peter Blatty

Her shoes were comfortable. They reflected her hope for the evening.

~ William Peter Blatty

The child was slender as fleeting hope.

~ William Peter Blatty

Perhaps evil is the crucible of goodness... and perhaps even Satan - Satan, in spite of himself - somehow serves to work out the will of God.

~ William Peter Blatty