Repeat — because the teaching is repeated
Word by word
MeaningRepetition (is necessary), because of the repeated instruction.
ExplanationThe last chapter is on the fruit, but it opens with the practice that leads to it. “The Self is to be seen, heard, reflected on and meditated upon” (Bṛhadāraṇyaka 2.4.5). Words like “meditate” imply continuity, and Uddālaka teaches “you are That” to Śvetaketu nine times. So hearing and reflection must be repeated until the knowledge is firm.
Philosophical aspectFor one with a perfectly prepared mind a single hearing may suffice; for most, repetition removes doubt and contrary habits of thought. This is the basis of the classical sequence śravaṇa–manana–nididhyāsana.