When you summarize in your own words and connect ideas, you move from collecting to contributing. Instead of hoarding quotes, you record arguments, counterpoints, and consequences. That extra effort compounds later, because each new question can draw strength from the structure built by earlier thinking.
A highlight without context is brittle. Add why it mattered, what it challenges, where it applies, and how it misleads. Such context prevents note rot, accelerates retrieval, and makes future you grateful, because the reasoning path is recoverable even years after the original spark.
The habit seems slow at first: rephrase, link, and refactor. Yet every tiny improvement reduces future friction. Over months, search becomes serendipity, revisiting becomes refinement, and your archive begins to propose answers, trajectories, and experiments instead of merely storing fragments you barely remember.