First, the history of mathematics can help us understand what problems the sages encountered, how they solved them, and how they thought of solving these problems, thus opening up new ideas and providing solutions for us.

Secondly, from the perspective of the history of mathematics, the reason why China's modern mathematics is backward lies in the backwardness of mathematical thinking and methods, failing to keep up with the forefront of mathematical development. When western countries have mastered the concepts of limit and infinitesimal, we are just addicted to some arithmetic tricks.

Thirdly, every mathematical crisis is a mathematical revolution, which brings us new mathematical ideas and methods. It fundamentally changed our view of mathematics and the whole world.