Possible Clues:

• “I believe”, archaically or jocularly
• It's my opinion to write with this in spirit
• Seems to me that could be the writer among the spirits
• Seems to me that perhaps these might be used for spirit writing
• I imagine there's writing material in spirits
• Seems to me that for the writer it's in spirit
• 'The lady doth protest too much, - - ' Shakespeare's Hamlet
• My opinion is (old-fashioned)
• The misguided in fur coats, I feel ...
• I believe what writer needs is to be immersed in the spirit