THREE:In the mean time, during the two years in which Maria Theresa was making these conquests, Frederick, alarmed by the aggrandizement of Austria and the weakening of France, while unavailingly striving to promote peace, was busily employed in the administration of his internal affairs. He encouraged letters; devoted much attention to the Academy of Arts and Sciences; reared the most beautiful opera-house in Europe; devoted large sums to secure the finest musicians and the most exquisite ballet-dancers which Europe could afford. He sought to make his capital attractive to all those throughout Europe who were inspired by a thirst for knowledge, or who were in the pursuit of pleasure.The king, in a letter to Voltaire upon this occasion, writes:
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