This book includes one lesson from each of 26 contemporary scholars from Tsinghua University, which focuses on their classic theories, unique thinking and major discoveries. All the contents have been prepared with great care, which represent the highest level of contemporary humanities and social sciences at Tsinghua University, and are the continuation of Tsinghua University’s traditional thinking of a shared fate with the country and the nation that has been abided by for over a century. The contents of the 26 lectures are all from the “Humanitas Tsinghua” forum, which was launched in early 2016 as a large academic event in Tsinghua University dedicated to building a public sphere for the continuous voice of humanistic thoughts so as to promote the daily improvement of humanistic culture and social progress.