"真に狂気と言えるのは空中に城を建て地上の偉人たちがそれに住むことを承知すると仮定することだけである"

Simplified Meaning:

Trying to create big, unrealistic dreams and expecting important or influential people to make them come true is the real foolishness. Imagine you dream of building a huge, fancy house in the sky with no support underneath. You think that famous and powerful people will come and live in it. This is like having ideas that are not based on reality and expecting others to make them happen, even when it’s not possible. For instance, someone might dream of becoming a world-famous musician without ever learning to play an instrument or singing. They might think a big music producer will magically discover them and make them a star. In reality, becoming successful in music takes a lot of hard work, practice, and sometimes a bit of luck. So, instead of dreaming of impossible things and waiting for others to fulfill them, it’s better to set realistic goals and work step by step towards them. This way, you build a strong foundation for your dreams and have a better chance of achieving something great on your own.