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可观测细胞亚结构和超微结构的显微镜是
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可以用来鉴定白喉杆菌的特征性成分是
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From the standpoint of daily life, however, there is one thing we do know that man is here for the sake of other men—above all for those upon whose smile and well-being our own happiness depends, and also for the countless unknown souls with whose fate we are connected by a bond of sympathy. Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I have received. My peace of mind is often troubled by the depressing sense that I have borrowed too heavily from the work of other men.
To ponder interminably over the reason for one's own existence or the meaning of life in general seems to me, from an objective point of view, to be sheer foxily. And yet everyone holds certain ideals by which he guides his aspiration and his judgment. The ideals which have always shone before me and filled me with the joy of living are goodness, beauty, and truth. To make a goal of comfort and happiness has never appealed to me; a system of ethics built on this basis would be sufficient only for a herd of cattle.
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