Source: The Demon-Haunted World : Science as a Candle in the Dark (1995), Ch. 2 : Science and Hope 
Context: I worry that, especially as the Millennium edges nearer, pseudo-science and superstition will seem year by year more tempting, the siren song of unreason more sonorous and attractive. Where have we heard it before? Whenever our ethnic or national prejudices are aroused, in times of scarcity, during challenges to national self-esteem or nerve, when we agonize about our diminished cosmic place and purpose, or when fanaticism is bubbling up around us-then, habits of thought familiar from ages past reach for the controls. The candle flame gutters. Its little pool of light trembles. Darkness gathers. The demons begin to stir.
                                    
“…if my fire is not large, it is yet real, and there may be those who can light their candle at its flame.”
            forward 
The Pursuit of God (1957)
        
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Aiden Wilson Tozer 31
American missionary 1897–1963Related quotes
                                        
                                        Biko 
Song lyrics, Peter Gabriel (III) (1980)
                                    
“Carry a candle in the dark, be a candle in the dark, know that you're a flame in the dark.”
“I light my candle from their torches.”
                                        
                                        Section 2, member 5, subsection 1. 
The Anatomy of Melancholy (1621), Part III