Floating words are empty and derogatory, stealing is not what I am afraid of. From Zu Chongzhi, it means that no matter how the outside world comments, praises and slanders, I am totally unmoved, fearless and just want to do my own thing. These two famous sayings written by Zu Chongzhi have fully realized the lofty qualities of a scientist who is not afraid of powerful people, pursues truth and seeks truth from facts. It embodies the fearless scientific spirit.