过去总是在我们的生活中存在，塑造着我们的未来。
学习数学的最好方法就是去做数学。
【译文】 子贡问怎样实现仁，孔子说：“工人要做好工，必先磨好工具。生活在那里，就要追随那里的品德高尚的领导，结交那里的仁义之士。”
The melancholy science from which I make this offering to my friend relates to a region that from time immemorial was regarded as the true field of philosophy, but which, since the latter's conversion into method, has lapsed into intellectual neglect, sententious whimsy, and finally oblivion.