You are aware, my dear sir, —you must have observed it in your own experience, —that all human progress is in a circle; or, to use a more accurate and beautiful figure, in an ascending spiral curve.

亲爱的先生，您知道——您一定在自己的经历中观察到了这一点——人类的所有进步都是在一个循环中进行的；或者，用一个更准确、更漂亮的图形，在上升的螺旋曲线中。