"一个人如果不经常感到悲伤，他就不能对这个世界深有感触。"

Simplified Meaning:

When someone cares a lot about what’s happening around them, they often feel sad because they notice the bad things more. For example, if a person really pays attention to the news and sees stories about wars, natural disasters, or people suffering, it makes them feel upset because they understand how hard these situations are. This happens because they have a big heart and they feel emotions strongly. To think about it another way, imagine a friend who always listens to others' problems. They might feel heavy at times because they take on a bit of everyone's sadness. If you’re deeply moved by what’s going on in the world, it’s normal to feel sorrow sometimes. Paying attention to your feelings and finding ways to cope, like talking to friends or taking breaks from the news, can help manage this sadness. This shows the importance of balancing care for the world with care for oneself.