"よく生きる人はよく説教する。"

Simplified Meaning:

When someone lives their life in a good, honest way, it shows through their actions more than just their words. For example, think about a teacher who always talks about the importance of kindness. If this teacher is also very kind to their students, helps others without being asked, and is always patient, their actions make their message stronger and more believable. Actions are often more powerful than words. If someone talks about doing good things but never actually does them, people won't take them as seriously. On the other hand, if a person's actions reflect their values, people will respect and trust them more. For example, a leader who works hard, treats everyone fairly, and stays humble is more likely to inspire and gain the trust of their team. Their life becomes a real example that others can follow. So, to inspire others and make a positive impact, it's important to live in a way that matches what you talk about.