The lecturer used the analogy of holding a glass of water to demonstrate how burdens feel heavier over time. While a glass of water weighs the same, holding it for a long period makes the arm ache and feel heavier. Similarly, problems that seem manageable at first become increasingly difficult to bear if we carry them with us constantly without rest. The lecturer's advice was to periodically put down our burdens, rest, and pick them up again later when refreshed, rather than continuously shouldering our problems, as that sustains us and allows us to continue making progress.