“The least contaminated memory,” wrote Sarah Manguso in her magnificent meditation on memory and the ongoingness of time, “might exist in the brain of a patient with amnesia — in the brain of someone who cannot contaminate it by remembering it.” Those contaminations, of course, are the very act of living, and slicing this paradox asunder is the double-edged sword of memory itself — something legendary neurologist Oliver Sacks captured perfectly in observing that we humans are equipped with “memory systems that have fallibilities, frailties, and imperfections — but also great flexibility and creativity.”
Source: An Illustrated Meditation on Memory and Its Imperfections, Inspired by Borges | Brain Pickings