A tether must be checked repeatedly. The expression لَهُوَ أَشَدُّ تَفَصِّيًا emphasizes how readily memorized wording can slip away; أَشَدُّ is a comparative form, meaning “more intense” or “more rapid” in context.
When a memorized passage weakens, a practical response is to establish a review schedule, identify difficult transitions, recite to someone who can correct errors, and maintain a steady routine. The comparison teaches preventive care rather than despair over a mistake.