The Buddha's Instructions on the Dhammas

The Buddha repeated this refrain 13 different times. For each specific set of instructions, he highlights the way we should be using that particular instruction in our meditation. So clearly if he repeated it 13 times in one Suta, he means for us to pay attention to it. We must train the mind to know these sense impressions, these perceptions, and not get lost in them. Just this is the aim of all this difficult practice we put ourselves through. It's really coming back to the natural ease of mind, practicing not getting lost.