"何をしても決して十分ではない。"

Simplified Meaning:

This quote suggests that sometimes, no matter how hard we try or how much effort we put into something, it might seem like our actions or results aren't sufficient. Imagine a student who studies very hard for an exam, but no matter how much they prepare, they always feel they could have done more or learned more. This feeling can happen in many parts of life, like at work, in relationships, or when setting personal goals. In history, think about great inventors like Thomas Edison. He invented the lightbulb, but even after creating such an important device, he kept working on new ideas and inventions. He didn't stop or feel entirely satisfied with one success; he kept pushing forward. For regular people, this lesson means not to get discouraged if things don't seem perfect or complete. Instead, take pride in the effort you put in and recognize that continuous improvement is a part of life. It's important to set realistic expectations and appreciate each step you take toward your goals, even if the final outcome isn't exactly as you imagined.