我珍惜类比胜于任何别的东西.——开普勒类比是发明创造的主要源泉之一,如鲁班被一种草叶上的锐齿割破手指,由此类比联想,发明了锯子.类比似乎在一切数学发现中有作用,而且在某些发现中有最大的作用,它是数学活动中“伟大的引路人”. I cherish the analogies over anything else.-Kepler’s analogy is one of the main sources of invention and creation, with Luban being cut by a sharp tooth on a blade of grass and thus invented by analogies. It seems to have a role in all mathematical discoveries and, in some discoveries, it has the greatest effect. It is the “great guide” in mathematical activity.