Sentence:  Like some <WSD>ignis fatuus</WSD> belated upon the road behind them which all could see and of which none spoke. For this will to deceive that is in things luminous may manifest itself likewise in retrospect and so by sleight of some fixed part of a journey already accomplished may also post men to fraudulent destinies. 
Meaning of the word marked with <WSD> tags:  A delusion, a false hope.