Psychologically: Will-o'-the-wisp symbolises tempting ideas, plans and aims which do not stand firm of a reality check, however, - one may not be enticed of it, even if they seem so amusing still. Popular: (arab).: see: the light is deceptive, lets you not tempt. (16, 49) (European ones).: see: one cannot be tempted, - 'the light is deceptive', one should leave the wrong way again, (ind).: a coarse deception approaches you.