"Prayers born out of murmuring are always dangerous. When, therefore, we are in a discontented mood, let'us take care what we cry for, lest God give it to us, and thereby punish us."

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The rare earth elements perplex us in our researches, baffle us in our speculations, and haunt us in our very dreams. They stretch like an unknown sea before us mocking, mystifying and murmuring strange revelations and possibilities.

— William Crookes