This sentence came from a fable in Chuang Tzu's Xiaoyao You. It was about a butterfly whose wings were full of patterns, which triggered the butterfly's infinite imagination and pursuit. However, the butterfly could not fly over the sea because it was full of expectations for the other side of the sea. The meaning of this sentence is to tell us that life is full of all kinds of limitations and impossibilities. The things we pursue often cannot be truly realized because our expectations and ideals themselves will limit our abilities. It's like the patterns on the wings of a butterfly. Although they can arouse our interest and imagination, they can't let us fly like real wings. This sentence also reminds us that we should cherish the reality in front of us and not pursue unrealistic things too much. At the same time, we should not give up our pursuits and dreams because there will always be some limitations and impossibilities in life. However, as long as we remain optimistic and determined, we will definitely be able to overcome the difficulties and achieve our goals.