A person can know every fact and still misunderstand which fact matters most.

Facts are cheap compared to weighting. You can hold an accurate picture of everything in front of you and still rank it badly, treating a detail as central because it is loud or recent or emotionally charged. Understanding is not the sum of what you know; it is the order you put it in. That ordering happens quietly, usually before you notice you have done it.

When you are stuck on a decision, try listing what you know and then asking which single item would change your answer if it were false. The things that survive that test are the ones actually carrying weight. The rest is background, and treating it as background frees attention for what matters.