"人々が皮肉を言うことに注目すれば、彼らに何が欠けているのかを発見することがよくある。"

Simplified Meaning:

When people criticize or are skeptical about something, it's often because they don't have it themselves. For instance, if someone frequently doubts the importance of money or success, it might be because they struggle financially or feel unsuccessful. They might say negative things about wealthy people or the importance of having a career, but this could be because deep down, they wish they had more money or a better job. In another example, consider someone who constantly mocks the idea of true love or happy relationships. This could reveal that they've never experienced a loving relationship or feel lonely. Rather than admitting their desire, they protect themselves by acting like love isn't important. By paying attention to what people are negative about, you can learn a lot about their insecurities or desires. Knowing this can help you understand others better and approach them with more empathy. It can also help you reflect on your own life—recognize if you're dismissing something because you truly believe it, or because you feel you can't have it.