"I shall never marry; and why should you speak of my having children! I am just as likely to give birth to a Nero as to an Augustus." Having assumed the throne, she ruled with a strictness of government such as Sweden had not known before. She took the reins of state into her own hands and carried out a foreign policy of her own, over the heads of her ministers, and even against the wishes of her people. The fighting upon the Continent had dragged out to a weary length, but the Swedes, on the whole, had scored a marked advantage. For this reason the war was popular, and every one wished it to go on; but Christina, of her own will, decided that it must stop, that mere glory was not to be considered against material advantages. Sweden had had enough of glory; she must now look to her enrichment and prosperity through the channels of peace. Therefore, in 1648, against Oxenstierna, against her generals, and against her people, she exercised her royal power and brought the Thirty Years' War to an end by the so-called Peace of Westphalia. At this time she was twenty-two, and by her personal influence she had ended one of the greatest struggles of history. Nor had she done it to her country's loss. Denmark yielded up rich provinces, while Germany was compelled to grant Sweden membership in the German diet. Then came a period of immense prosperity through commerce, through economies in government, through the improvement of agriculture and the opening of mines. This girl queen, without intrigue, without descending from her native nobility to peep and whisper with shady diplomats, showed herself in reality a great monarch, a true Semiramis of the north, more worthy of respect and reverence than Elizabeth of England. She was highly trained in many arts. She was fond of study, spoke Latin fluently, and could argue with Salmasius, Descartes, and other accomplished scholars without showing any inferiority to them. She gathered at her court distinguished persons from all countries. She repelled those who sought her hand, and she was pure and truthful and worthy of all men's admiration. Had she died at this time history would rank her with the greatest of women sovereigns. Naude, the librarian of Cardinal Mazarin, wrote of her to the scientist Gassendi in these words: To say truth, I am sometimes afraid lest the common saying should be verified in her, that short is the life and rare the old age of those who surpass the common limits. Do not imagine that she is learned only in books, for she is equally so in painting, architecture, sculpture, medals, antiquities, and all curiosities. There is not a cunning workman in these arts but she has him fetched. There are as good workers in wax and in enamel, engravers, singers, players, dancers here as will be found anywhere.