There is an important principle in economics: people face trade-offs. What determines a person's fate is often not what they choose, but what they are willing to give up. Because resources are limited, time is limited, and energy is limited, life is essentially a continuous process of making choices. Every decision means giving up another possibility; every gain comes with a cost that must be borne. Once you see this clearly, you'll realize that the real question in life is never "What do I want?" but rather, "What am I willing to give up to get it?"