“O God, if there be a God, save my soul, if I have a soul.”
Quoting for posterity the remarks of an unnamed soldier at the Battle of Blenheim (13 August 1704), as reported by William King in Political and Literary Anecdotes of His Own Times http://books.google.com/books?id=ShklAAAAMAAJ&q=%22O+God+if+there+be+a+God+save+my+soul+if+I+have+a+soul%22&pg=PA8#v=onepage (1818)
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Sir William Wyndham, 3rd Baronet 1
politician, died 1740 1688–1740Related quotes

No. 453 (9 August 1712)
The Spectator (1711–1714)

Source: On the Mystical Body of Christ, p.429

“I am standing on the threshold of another trembling world. May God have mercy on my soul.”
Diary entry http://larkspirit.com/hungerstrikes/diary.html, (1 March 1981), the first day of his hunger strike, in Skylark Sing your Lonely Song : An Anthology of the Writings of Bobby Sands (1991).
Other writings

Matthew vi. 33
A Narrative of Some of the Lord's Dealings with George Müller Written by Himself, First Part.
First Part of Narrative

Aceldama : A Place To Bury Strangers In (1898) Preface.