How do you end a prayer?

As I am thinking of ending this letter, the shadow of a saying crosses my memory, that of good things there are always three. 

I forget which of earth's tongues has moulded this into a proverb, but something more than a proverb often troubles me now—

I remember that I used to be taught to believe in the Trinity, in Unity, but I never get beyond the two now—I know something of a Father, and something of a Saviour, but was not there a third to help one to say our Father and my Saviour?

Alas, the idea is a blank now, leaving a shadow to haunt me!

Letters from Hell