"美国没有永久的朋友或敌人，只有利益。"

Simplified Meaning:

Countries act based on what benefits them the most at any given time. Just like how a business makes decisions to make more money, a country makes allies or goes against others to protect and improve its own situation. For example, during World War II, the United States and the Soviet Union were allies because they had the common goal of defeating Nazi Germany. However, after the war, they became adversaries during the Cold War because their interests no longer aligned. Similarly, if today it benefits a country to cooperate with another, they will join forces, and if tomorrow their goals change, they might become opponents. This way of thinking helps countries stay flexible and focus on their priorities rather than being loyal to the same friends or enemies over time. For individuals, it means being prepared to shift your alliances based on what's best for your growth and well-being, rather than sticking rigidly to old ties that no longer serve you.