"自分が失敗した事業で馬鹿者が成功するのを見ることほど屈辱的なことはない"

Simplified Meaning:

It feels really frustrating and embarrassing when someone you think isn't very smart does well at something you couldn't succeed in. Imagine you studied hard for a math test but didn't get a good score. Then, someone who never studies at all ends up getting an A. It's not just about your feelings getting hurt; it's about seeing someone succeed easily at something you put a lot of effort into. This can make you question your own abilities and feel like your hard work wasn't worth it. To handle situations like this, it's important to focus on your own progress and not compare yourself to others. Everyone has different strengths and weaknesses, and sometimes luck or unexpected factors play a role in success. Keeping a positive attitude and learning from your mistakes can help you improve and achieve your own goals, regardless of what others are doing.