This book is Pascals unfinished manuscripts before his death, which is the concentrated reflection of the authors besides the trend of Descartes rationalism, he finds out another approach both inherit and carry forward the tradition of rationalism, using reason to criticize everything; At the same time, he points out the inner contradiction of the rationalism itself, and applies special methods to reveal the contradiction. This book repeatedly expounds peoples contradiction between the two limits, the infinity and infinitesimal opposition. He demonstrates the paradox that people are both noble and weak.