"他国で自由を促進する最善の方法は、ここで我々の民主主義体制が模範に値するものであることを示すことです。"

Simplified Meaning:

If we want other countries to adopt and appreciate our democratic way of life, we need to show by our own actions that it works well and is worth copying. Imagine you have a new method for doing something at school or work that you think is great. The best way for people to understand and adopt your method is by seeing you use it successfully and being impressed by the results. Take for example, during the Civil Rights Movement in the United States. When people across the world saw Americans fighting for and successfully achieving more equality and freedom, it inspired others to believe in those democratic principles. They could see the positive changes happening and wanted the same for their own countries. In your own life, if you believe in honesty or hard work, the best way to convince others is by being honest and hardworking yourself. People will notice the benefits you get, like trust from friends or success in your job, and they might be inspired to do the same. Showing the value of your beliefs through your actions is far more effective than just telling others they are good.