"All that glitters is not gold" is from _Parabolae_, a book of poems
written circa 1175 by Alanus de Insulis, a French monk: _Non teneas
aurum totum quod splendet ut aurum_ = "Do not hold everything gold that
shines like gold". It was Englished by Chaucer in the _Canterbury
Tales_ (1389) as: "But al thyng which that shyneth as the gold / Nis
nat gold, as that I have herd it told."