Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.
What makes Adams's observation so sharp is that he's not simply saying "stick with things and they'll work out"—he's describing a genuine *transformation* in how problems reveal themselves. Obstacles don't vanish because you've suddenly become stronger; they vanish because patient, steady effort exposes their actual shape and size, often proving them far less formidable than our initial fear suggested. When you're learning a difficult instrument, for instance, a passage that seemed impossibly complex after two weeks of frustrated practice often becomes merely technical after two months—the barrier didn't shrink so much as your understanding illuminated it. That's the magic Adams meant: not superhuman willpower, but the clarity that only time and repetition provide.