John Bunyan on how our own mind can deceive us

{162} One thing I would not let slip. I took notice that now poor Christian was so confounded, that he did not know his own voice; and thus I perceived it. Just when he was come over against the mouth of the burning pit, one of the wicked ones got behind him, and stepped up softly to him, and whisperingly suggested many grievous blasphemies to him, which he verily thought had proceeded from his own mind. This put Christian more to it than anything that he met with before, even to think that he should now blaspheme him that he loved so much before; yet, if he could have helped it, he would not have done it; but he had not the discretion either to stop his ears, or to know from whence these blasphemies came.

This is an extract from Pilgrim's Progress by John Bunyan (1678, public domain. One version gives paragraph numbers.) Bunyan included the scriptural references in the book. Pilgrim's Progress, though little read now, was important enough to have been considered, for a century or two, the most important writing in English, except for the Bible.

This is not meant as an April Fool's joke, although it shows how Satan can deceive us, even through our own minds, if Bunyan is correct on this matter (and I believe that he is).

Thanks for reading.