The source of this sentence should be like this. I forgot the details. The original text probably said that a great scientist (who studies cosmic celestial bodies) was so fascinated by research that he had to look at the stars in the sky when he walked, so that he once fell into stagnant water after the rain and laughed at others. Generally speaking, argumentative writing can be started from two aspects. On the one hand, as upstairs said, set goals and be not afraid of falling. On the other hand, do what you can and don't be too ambitious.