Whatever the form is that you consider as part of your sitting practice, the encouragement is to repeat. The reason that this is so important is if you repeat, you’ll see that you’re not actually ever repeating, it’s always different. At first it might be some intense contrast but eventually it’s very slight understanding about the way consciousness works and you understand it in such a way that there’s no way you can put it in words but your understanding is starting to deepen. This is how you approach the dharmadhatu, the realm of truth.

https://www.youtube.com/watch?v=eSE_bngtn7U