I have heard another say, “I am tormented with horrible thoughts. Wherever I go, blasphemies steal in upon me. Frequently at my work a dreadful suggestion forces itself upon me, and even on my bed I am startled from my sleep by whispers of the evil one. I cannot get away from this horrible temptation.” Friend, I know what you mean, for I have myself been hunted by this wolf. A man might as well hope to fight a swarm of flies with a sword as to master his own thoughts when they are set on by the devil… Remember Martin Luther’s way of cutting the devil’s head off with his own sword. “Oh,” said the devil to Martin Luther, “you are a sinner.” “Yes,” said he, “Christ died to save sinners.” Thus he smote him with his own sword. Hide you in this refuge and keep there; “In due time Christ died for the ungodly.” If you stand to the truth, your blasphemous thoughts which you have not the strength to drive away will go away of themselves; for Satan will see that he is answering no purpose by plaguing you with them… The poor diseased or woman could not come to Jesus for the press, and you are in much the same condition, because of their rush and throng of these dreadful thoughts. Still, she put forth your finger, and touched the fringe of the Lord’s garment, and she was healed. Do you the same.
Charles Spurgeon (1834-1892)
All of Grace, Trinity Press, 2011, 67-9.
GraceQuotes.com 
Reading this post and being a full on Grace believing Christian who suffers from mental illness, I can almost assure you that this man suffered from OCD. Horrible illness. I was planning my suicide because of it and was comforted at the thought of escaping the torturous thoughts and urges coursing through my mind and body through death. It was then that my dear wife put on a Joseph Prince DVD and by listening to it, it cut through the OCD and spoke to my spirit loud and clear. It was then that I began to ever so slowly heal from OCD and psychotic depression. Knowing that whatever happened from this illness I was already forgiven and safe in his arms eternally gave me not a sense of permission to do wrong but a love and heart peace for my Jesus. To anyone out there with mental illness, the Grace of the Lord Jesus Christ our brother is always available to begin your recovery and new life. Grace and peace to you all. -Randal-
What an amazing testimony of God’s grace, working as it should in the life of a believer! Thanks for sharing that, brother.