According to Osho, you remember useless things because the mind feeds on the nonessential and defends its dominance by blocking what nourishes your essence. The thick circumference admits trivia that decorates the surface but prevents essentials from reaching the center. Only a tiny portion penetrates, so truth fades. Deliberate awareness—listening totally, meditation—thins the circumference, letting the essential imprint and endure.
Your mind prefers gossip over truth, so it keeps the deep stuff from sinking in; be more aware so the important things reach your heart and stay.