All that glitters is not gold
The saying all that glitters is not gold means that simply because something may appear priceless, pleasing or pretty, it's no sign that without a doubt it will be worth having once its true nature has been discovered. In other words don't rely on the superficial. The proverb has been around a long time in a mixture of forms; akin to the Latin: Non omne quod nitet aurum est or `Not all that shines is gold.'
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Origin
Shakespeare is the best-known writer to have expressed this idea. The original Shakespeare editions of The Merchant of Venice, 1596, have the line as 'all that glisters is not gold'. 'Glister' is usually replaced by 'glitter' in renditions of the play:
http://www.phrases.org.uk/meanings/28450…
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