The Fourth Exercise is a summary — a one-line directive to repeat the Third without wandering, going through the memory of what has already been contemplated. This is the Ignatian principle of repetition stated in its most compressed form. The retreatant is not adding new material. He is settling deeper into material already opened. Repetition in the Exercises functions as ripening, not retention; the matter is given time to soak in until what was understood becomes what is felt. The Tibetan teacher Patrul Rinpoche treats the preliminary practices of ngöndro the same way: a hundred thousand prostrations works as a duration in which something is allowed to happen, not as a count to be completed.